Theoretical investigation of the conrotatory ring opening of cyclobutene and 1,2-dihydro-1,2-diazacyclobutadienes with ab initio and density functional Gaussian-type orbital approach

B. S. Jursic, Z. Zdravkovski, Theoretical investigation of the conrotatory ring opening of cyclobutene and 1,2-dihydro-1,2-diazacyclobutadienes with ab initio and density functional Gaussian-type orbital approach, International Journal of Quantum Chemistry, 56, 115–123 (1995).