@Book{Tietze1949,
author  = "Tietze, Heinrich",
title   = "Zusammenstellung einiger Werte des Integrallogarithmus",
year    = "1949",
address = "München",
series  = "Sitzungsberichte",
volume  = "1947,6.",
url     = "https://publikationen.badw.de/de/003395822",
}