THEORETICAL STUDY OF CONCERTED DIELS-ALDER REACTIONS BETWEEN DIMETHYL 1,2,4,5-TETRAZINE-3,6-DICARBOXYLATE AND DIENOPHILES. (2009). Al-Nahrain Journal of Science, 12(1), 14-23. https://anjs.edu.iq/index.php/anjs/article/view/1257