1964
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Robert Daniel Etchécopar, « Niethammer, G. ; Niethammer, J. et Szijj, J. — Die Einbürgerung von Saugetieren und Vögeln in Europa. Ergebnisse und Aussichten. Hambourg et Berlin. Paul Parey, 1963 », Revue d'Écologie (La Terre et La Vie) (documents), ID : 10670/1.9pqwx5