@article{Huber,
  author    = {Huber, Albert},
  title     = {The gravitational field of a massless particle on the horizon of a stationary black hole},
  series = {Classical and Quantum Gravity},
  journal   = {Classical and Quantum Gravity},
  abstract  = {In this work, the field of a gravitational shockwave generated by a massless point-like particle is calculated at the event horizon of a stationary Kerr-Newman black hole. Using the geometric framework of generalized Kerr-Schild deformations in combination with the spin-coefficient formalism of Newman and Penrose, it is shown that the field equations of the theory, at the event horizon of the black hole, can be reduced to a single linear ordinary differential equation for the so-called profile function of the geometry. This differential relation is solved exactly. Based on the results obtained, a physical interpretation is given for the found shockwave spacetime, and it is clarified how these results lead back to those of previous works on the subject, which deal with the much simpler cases of gravitational shockwaves in static black hole backgrounds.},
  subject      = {Gravitation},
  language  = {en}
}
@article{HoffmannKuba,
  author    = {Hoffmann, Michael E. and Kuba, Markus},
  title     = {Logarithmic integrals, zeta values, and tiered binomial coeffcients},
  series = {Monatshefte fuer Mathematik},
  journal   = {Monatshefte fuer Mathematik},
  subject      = {Integrals},
  language  = {en}
}
@article{BelkacemKupkaPhilidetetal.,
  author    = {Belkacem, K{\´e}vin and Kupka, Friedrich and Philidet, Jordan and Samadi, R{\´e}za},
  title     = {Surface effects and turbulent pressure. Assessing the Gas-Γ1 and Reduced-Γ1 empirical models.},
  series = {Astronomy \& Astrophysics},
  journal   = {Astronomy \& Astrophysics},
  subject      = {Surface},
  language  = {en}
}
@article{RauerKroissKryvinskaetal.,
  author    = {Rauer, Johannes Nikolaus and Kroiss, Michael and Kryvinska, Natalia and Engelhardt-Nowitzki, Corinna and Aburaia, Mohamed},
  title     = {Cross-university virtual teamwork as a means of internationalization at home},
  series = {The International Journal of Management Education, Volume 19, Issue 3},
  journal   = {The International Journal of Management Education, Volume 19, Issue 3},
  number    = {Issue 3},
  subject      = {Virtual Teamwork},
  language  = {en}
}
@article{SinelnikovaMandlAgeliietal.,
  author    = {Sinelnikova, Anna and Mandl, Thomas and Agelii, Harald and Gr{\aa}n{\"a}s, Oscar and Marklund, Erik G. and Caleman, Carl and De Santis, Emiliano},
  title     = {Protein orientation in time-dependent electric fields: orientation before destruction},
  series = {Biophysical Journal},
  journal   = {Biophysical Journal},
  number    = {Volume 120, Issue 17},
  pages     = {3709 -- 3717},
  subject      = {Protein},
  language  = {en}
}
@article{KubaVarvak,
  author    = {Kuba, Markus and Varvak, Anna},
  title     = {On Path diagrams and Stirling permutations},
  series = {S{\´e}minaire Lotharingien de Combinatoire},
  journal   = {S{\´e}minaire Lotharingien de Combinatoire},
  number    = {B82c (2021)},
  pages     = {28},
  abstract  = {A permutation can be locally classified according to the four local types: peaks, valleys, double rises and double falls. The corresponding classification of binary increasing trees uses four different types of nodes. Flajolet demonstrated the continued fraction representation of the generating function of local types, using a classical bijection between permutations, binary increasing trees, and suitably defined path diagrams induced by Motzkin paths. The aim of this article is to extend the notion of local types from permutations to k-Stirling permutations (also known as k-multipermutations). We establish a bijection of these local types to node types of (k+1)-ary increasing trees. We present a branched continued fraction representation of the generating function of these local types through a bijection with path diagrams induced by Łukasiewicz paths, generalizing the results from permutations to arbitrary k-Stirling permutations. We further show that the generating function of ordinary Stirling permutation has at least three branched continued fraction representations, using correspondences between non-standard increasing trees, k-Stirling permutations and path diagrams.},
  subject      = {Kettenbruch},
  language  = {en}
}
@article{Wala,
  author    = {Wala, Thomas},
  title     = {Fitness im B{\"u}ro mit Active Workplace Design},
  series = {Wirtschaft und Management : Schriftenreihe zur wirtschaftswissenschaftlichen Forschung und Praxis},
  journal   = {Wirtschaft und Management : Schriftenreihe zur wirtschaftswissenschaftlichen Forschung und Praxis},
  number    = {31},
  pages     = {47 -- 58},
  abstract  = {Wissensarbeiter:innen verbringen den {\"u}berwiegenden Teil ihrer Arbeitszeit sitzend vor dem Computer. Die negativen Folgen von langem Sitzen f{\"u}r die Gesundheit sind bekannt: Zu langes Sitzen bedingt einen niedrigen Kalorienverbrauch, der Stoffwechsel und das Herz-Kreislaufsystem laufen auf Sparflamme. Entsprechend steigt das Risiko f{\"u}r {\"U}bergewicht, Diabetes, Bandscheibenvorfall und Herz-Kreislauf- Erkrankungen. Unter den Folgen von langem Sitzen leiden aber nicht nur die betroffenen Mitarbeiter:innen selbst, sondern auch deren Arbeitgeber:innen, weil Mitarbeiter:innen mit einem auf Bewegungsmangel zur{\"u}ckzuf{\"u}hrenden reduzierten physischen und psychischen Wohlbefinden weniger produktiv und kreativ arbeiten bzw. aufgrund von Erkrankungen erst gar nicht arbeiten k{\"o}nnen. Der vorliegende Beitrag zeigt auf, wie Unternehmen durch das Setzen sanfter Bewegungszw{\"a}nge, den Einsatz dynamischer Arbeitsstationen sowie die Integration niederschwelliger Fitnessmodule in die B{\"u}rolandschaft f{\"u}r mehr k{\"o}rperliche Aktivit{\"a}t im Arbeitsalltag sorgen k{\"o}nnen.},
  subject      = {Arbeitsplatz},
  language  = {de}
}
@misc{Kupka,
  author    = {Kupka, Friedrich},
  title     = {Improvements to the Short-Characteristics Method in 3D RHD Simulations and some Unsolved Problems in Spectral Line Shapes of A-type Stars},
  subject      = {Convection},
  language  = {en}
}
@misc{Kupka,
  author    = {Kupka, Friedrich},
  title     = {Improvements in Numerical and Analytical Modelling Techniques to Study the Solar Surface},
  subject      = {Convection},
  language  = {en}
}
@misc{Kupka,
  author    = {Kupka, Friedrich},
  title     = {Advanced Convection Modelling in Asteroseismology and Stellar Evolution},
  subject      = {Convection},
  language  = {en}
}