Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) A. Nørlund Christensen and Jens Josephsen and Claus Erik Schäffer and Kenneth J. Watson and M. Sandström,Preparation and Crystal Structure of beta-Nb2N and gamma-NbN.,Acta Chemica Scandinavica,0904-213X,Danish Chemical Society,1976,30a,,219-224,https://cir.nii.ac.jp/crid/1363670319752438528,https://doi.org/10.3891/acta.chem.scand.30a-0219