@Book{Fedorov1913,
author  = "Fedorov, Evgraf S.",
title   = "Die Grundformeln der sphärischen und ebenen Tetragonometrie",
year    = "1913",
address = "München",
series  = "Sitzungsberichte",
volume  = "1913,16",
url     = "https://publikationen.badw.de/en/003395131",
}