@article{Kadijk1964, author = "Kadijk, F. and Huisman, R. and Jellinek, F.", title = "Niobium and tantalum diselenides", journal = "Recueil des Travaux Chimiques des Pays-Bas et de la Belgique", year = "1964", volume = "83", pages = "768-775", ASTM_id = "RTCPA3" } @article{Brown1965, author = "Brown, B.E. and Beerntsen, D.J.", title = "Layer structure polytypism among niobium and tantalum selenides", journal = "Acta Crystallographica (1,1948-23,1967)", year = "1965", volume = "18", pages = "31-36", ASTM_id = "ACCRA9" }