El-Abadelah, M. et al. 2010. 4,5-Dihydro-1,2,4-triazine-6-ones Condensed with Heterocycles, Part 1: Synthesis and Spectral Properties of Chiral 4,5-dihydro-6-oxo-1,2,4-triazino[4,5-b] 1,2,3,4-teterahydro-β-carbolines† . Asian Journal of Chemistry. 9, 3 (Mar. 2010), 474–478.