@misc{Boelling1997,
  author    = {B{\"o}lling, Reinhard},
  title     = {Mathematics of the 19th century, geometry, analytic function theory / ed. by A. N. Kolmogorov ... ;Basel [u.a.], Birkh{\"a}user, 1996},
  issn      = {0036-6978},
  year      = {1997},
  language  = {en}
}
@misc{Boelling1997,
  author    = {B{\"o}lling, Reinhard},
  title     = {Guzevic, D., Petr Petrovic Bazen, 1786 - 1838; Sankt-Peterburg, Nauka, 1995},
  year      = {1997},
  language  = {fr}
}