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JOULE, J.A.        Heterocyclic chemistry / J.A.Joule, K.Mills & G.F.Smith. – 3rd ed.. – United Kingdom : Stanley thornes, 2007.        xviii, 516 p. : ill.        Includes index        ISBN 0-7487-4069-4 :        1. Chemistry        1. Organic chemistry        1. রসায়ন        1. জৈব রসায়ন I. Mills, K. I. Smith, G.F.