Pure Appl. Chem., 1987, Vol. 59, No. 12, pp. 1571-1576
http://dx.doi.org/10.1351/pac198759121571
Recent studies of reactive intermediates. The limits of Hund's rule in pi-conjugated non-Kekule molecules
First page:

Pure Appl. Chem., 1987, Vol. 59, No. 12, pp. 1571-1576
http://dx.doi.org/10.1351/pac198759121571