O. Brea; M. El Khatib; C. Angeli; G.L. Bendazzoli; S. Evangelisti; T. Leininger (2013). "Behavior of the Position–Spread Tensor in Diatomic Systems". J. Chem. Theory Comput. 9 (12): 5286–5295. doi:10.1021/ct400453b. PMID26592266.
O. Brea; M. El Khatib; C. Angeli; G.L. Bendazzoli; S. Evangelisti; T. Leininger (2013). "Behavior of the Position–Spread Tensor in Diatomic Systems". J. Chem. Theory Comput. 9 (12): 5286–5295. doi:10.1021/ct400453b. PMID26592266.