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by Tyagi; Vipin
by Mayank Singh; P.K. Gupta; Vipin Tyagi
by Gupta, P. K.; Tyagi, Vipin; Singh, S. K.
by Singh, Mayank; Gupta, P. K.; Tyagi, Vipin; et al.
by Tyagi, Vipin
by Mishra, Anurag; Basu, Anirban; Tyagi, Vipin