Ginkel, A. C. van. (1987). Systematics and biostratigraphy of fusulinids of the Lena Formation (Carboniferous) near Puebla de Lillo (León, NW Spain). Proceeding Koniklijke Nederlandse Akadademie van Wetenschappen, Amsterdam. 90(3): 189-276.
289819
Ginkel, A. C. van
1987
Systematics and biostratigraphy of fusulinids of the Lena Formation (Carboniferous) near Puebla de Lillo (León, NW Spain)
Proceeding Koniklijke Nederlandse Akadademie van Wetenschappen, Amsterdam