@article {Umbgrove1925,
	title = {Die Anthozoa uit het Maastrichtsche tufkrijt [The Anthozoa of the Maastrichtian tufaceous chalk]},
	journal = {Leidse Geologische Mededelingen},
	volume = {1},
	year = {1925},
	pages = {83{\textendash}126, pl. 8{\textendash}11},
	keywords = {RCBS, SDC, TIP},
	url = {http://sdrv.ms/15QWFX2},
	author = {Umbgrove, J H F}
}
@article {Gerth1928,
	title = {Beitr{\"a}ge zur Kenntniss der mesozoischen Korallenfaunen von S{\"u}damerika},
	journal = {Leidse Geologische Mededelingen},
	volume = {3},
	year = {1928},
	pages = {1{\textendash}15, pl. 1{\textendash}2},
	keywords = {RCBS, TIP},
	author = {Gerth, H}
}
