^Durig, James R and Zhou, Xiaohua and Durig, Nicole E and Nguyen, Diepngan and Durig, Douglas T (2009). “Vibrational spectra and structural parameters of some XNCO and XOCN (X= H, F, Cl, Br) molecules”. Journal of Molecular Structure917 (1): 37-51.
^Rodriguez-Betancourtt, V-M and Quezada-Navarro, V-M and Neff, M and Rauhut, G (2011). “Anharmonic frequencies of [F, C, N, X] isomers (X= O, S) obtained from explicitly correlated coupled-cluster calculations”. Chemical Physics387 (1): 1-4.