Chhetri, Karan. Synthesis of Nitrogen containing polyheterocycles/ M.Phil. Karan Chhetri; Biswajit Gopal Roy. - Gangtok: Sikkim University, 2016. - 76 p. Subjects--Topical Terms: Organic Chemistry.Retrosynthetic--Analysis. Dewey Class. No.: 547.7 / CHH/S