Comparison of AM1 and PM3 semiempirical to ab initio methods in the study of Diels–Alder reactions of butadiene and cyclopentadiene with cyanoethylenes,

B. S. Jursic, Z. Zdravkovski, Comparison of AM1 and PM3 semiempirical to ab initio methods in the study of Diels–Alder reactions of butadiene and cyclopentadiene with cyanoethylenes, Journal of Molecular Structure (Theochem), 309, 249–257 (1994).