Co. Kangani et He. Master, STUDIES IN ANTHRAQUINONES - PREPARATION OF 2-SUBSTITUTED-PYRIMIDO ANTHRAQUINONES AND RELATED FUSED 1,2,4-TRIAZOLO, TETRAZOLO AND PYRAZOLINODERIVATIVES, Indian journal of chemistry. Sect. B: organic chemistry, including medical chemistry, 37(7), 1998, pp. 651-656