Bermudez, J. H.; Pinto, J. L.; Meléndez, C. M.; Henao, J. A.; Kouznetsov, V. V. Simple Preparation of New N-(6-Methyl-2-Nitrophenyl-1,2,3,4-Tetrahydroquinolin-4-Yl) Pyrrolidin-2-Ones and Their Spectroscopic Analysis. Universitas Scientiarum 2011, 16, 160-167.