“Thermolysis of N-aryl β-chlorovinylimines: Synthesis of 7,13-dibutyl-4-phenanthridino[3,2-a]-4- phenanthridino[2,3-j]anthracene, a novel cavity shaped diaazareneâ€. M. K. Haldar, G. K. Kar, J. K. Ray; Synlett, 1997, 9, 1057-1058.
“Alkyl lithiums as alkylating agents: Regioselective alkylations in the semi bay regions of polycyclic azaarenes. J. K. Ray, B. C. Roy, G. K. Kar; J. Org. Chem., 1996, 61(5), 1863-1866.
“Studies on polycyclic azaarenes-3: Stereoselective synthesis of trans 10,11-Dihydroxy-10,11-dihydrodibenz- [a,h]acridine and trans 8,9-dihydroxy-8,9-dihydroacenaphtho[1,2-b]quinolineâ€. J. K. Ray, G. K. Kar, A. C. Karmakar;  J. Org. Chem., 1991, 56(6), 2268-2270.