Lunelli, B., Roversi, P., Ortoleva, E., & Destro, R. (1997). Geometry and molecular parameters of 3,4-bis(dimethylamino)-3-cyclobutene-1,2 and its isomer bis(dimethylamino)squaraine - Combined study by IR spectroscopy, XRD and ab initio MO calculations (vol 92, pg 3611, 1996). JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS, 93(3), 513–513.

Lunelli, B., et al. “Geometry and Molecular Parameters of 3,4-Bis(Dimethylamino)-3-Cyclobutene-1,2 and Its Isomer Bis(Dimethylamino)Squaraine - Combined Study by IR Spectroscopy, XRD and Ab Initio MO Calculations (Vol 92, Pg 3611, 1996).” JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS, vol. 93, no. 3, 1997, pp. 513–13.

Lunelli, B, P Roversi, E Ortoleva, and R Destro. 1997. “Geometry and Molecular Parameters of 3,4-Bis(Dimethylamino)-3-Cyclobutene-1,2 and Its Isomer Bis(Dimethylamino)Squaraine - Combined Study by IR Spectroscopy, XRD and Ab Initio MO Calculations (Vol 92, Pg 3611, 1996).” JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS 93 (3): 513–13.