@book{id_6902,
author = "Volk, Otto",
title = "Über spezielle Kreisnetze",
year = "1929",
address = "München",
publisher = "Verl. d. Bayer. Akad. d. Wiss.",
series = "Sitzungsbericht der Bayerischen Akademie der Wissenschaften",
volume = "1929,7",
url = "http://publikationen.badw.de/de/003383279",
}