By Varma R. P.   Bhatnagar B. B.   Singh Anuradha   in Acta Acustica united with Acustica

ISSN:1610-1928|73|1|45-47

S. Hirzel Verlag‎(1991)‎

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By Bhatnagar B.   Sharma C.   Gautam A.   Kakar A.   Reddy D.   in International Journal of Colorectal Disease

ISSN:0179-1958|19|2|134-142

Springer Publishing Company ‎(2004)‎

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