Ramovs, A. (1971) «Connections of the Upper Carboniferous brachiopod faunas from the Carnic Alps and Karavanke Mountains with those of the Cantabrian Mountains (Spain) ROMANO, M. - A new Proetid trílobite from the Lower Westphalían of North-west Spain», Trabajos de Geología, 4(4), pp. 373–385. doi: 10.17811/tdg.4.1971.373-385.