found: Weber, Carl Maria von. Der Freischütz, p2001:notes, p. 6 (Christian Gerhaher, Ottokar/Kilian)
found: Schubert, F. Die schöne Müllerin [SR] 2006, p2003:container (Christian Gerhaher, baritone) insert (b. Straubing, Germany; baritone, also has a degree in medicine)
found: Int. ww in classical mus., 22nd ed.(Gerhaher, Christian; b. 1969, Straubing; bass-baritone)
found: German Wikipedia, February 28, 2020(Christian Gerhaher; born July 24, 1969, Straubing, Niederbayern; German opera singer (baritone) and voice teacher; professor of voice and oratorio at Hochschule für Musik und Theater München)