Меловой период

VILLALBA-BREVA S., MART?N-CLOSAS C., MARMI J., GOMEZ B., FERN?NDEZ-MARR?N M.T. (2012) Peat-forming plants in the Maastrichtian coals of the Eastern Pyrenees // Geologica Acta, Vol. 10, N? 1, 1-8

pdf: http://www.geologica-acta.com/pdf/vol1001a04.pdf