Mohanti, M. (1972). The Portilla Formation (Middle Devonian) of the Alba Syncline, Cantabrian Mountains, Prov. Leon, northwestern Spain: carbonate facies and rhynchonellid palaeontology. Leidse Geologische Mededelingen. 48: 135-205.
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Mohanti, M.
1972
The Portilla Formation (Middle Devonian) of the Alba Syncline, Cantabrian Mountains, Prov. Leon, northwestern Spain: carbonate facies and rhynchonellid palaeontology