Saurabh Pandey, Ambrish Kumar Srivastava, Anoop Pandey & Neeraj Misra. (1970). Theoretical Study of Small Niobium Sulphide Clusters, $Nb_nS_m (m,n=1, 2)$. Journal of Atomic and Molecular Sciences. 5 (3). 231-237. doi:10.4208/jams.040214.062114a