@article {Alvarez-Ramis1981,
	title = {{Estudio de Frenelopsis oligostomata (Romariz) Alvin, procedente del Cretacico superior de Torrelaguna (Madrid)}},
	journal = {Estudios Geologicos},
	volume = {37},
	number = {1-2},
	year = {1981},
	pages = {83{\textendash}87},
	issn = {0367-0449},
	author = {Alvarez-Ramis, C}
}
