Epizoan-sponge Interactions in the Early Ordovician of the Argentine Precordillera
The hexactinellid sponge Cyathophycus from the Upper Ordovician of the Argentine Precordillera
Post-glacial Hirnantian (Upper Ordovician) bryozoans from Western Argentina: Implications for survival and extinctions patterns
Ecuaciones Diferenciales en Derivadas Parciales Ecuaciones Tipo
