Badr M. Z. A., Mahgoub S. A., Moustafa O. S., Geies A. A
Chemistry and cyclization reactions of thienoquinoxaline derivatives: Part I
Phosph., Sulfur and Silicon and Relat. Elem, 79 (1993) N 1-4, S 77-85
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http://dx.doi.org/10.1080/10426509308034400