@article {Gumbel1862,
	title = {Die Streitberger Schwammlager und ihre Foraminiferen-einschl{\"u}sse},
	journal = {Jahreshefte des Vereins f{\"u}r Vaterl{\"a}ndische Naturkunde in W{\"u}rttemberg},
	volume = {18},
	year = {1862},
	pages = {192{\textendash}238},
	keywords = {RCBS, TIP},
	url = {http://archive.org/details/jahresheftedesve18vere},
	author = {G{\"u}mbel, C W}
}
@book {Gumbel1861,
	title = {Geognostische Beschreibung des bayerischen Alpengebirges und seines Vorlandes},
	year = {1861},
	pages = {950},
	publisher = {Justus Perthes},
	organization = {Justus Perthes},
	address = {Gotha},
	keywords = {RCBS, TIP},
	url = {http://books.google.com/books?id=SjBKAAAAYAAJ},
	author = {G{\"u}mbel, C W}
}
