By Hundal H.   Singh Kuldip   Singh Dhanwinder   in Environmental Monitoring and Assessment

ISSN:0167-6369|154|1-4|393-400

Springer Publishing Company ‎(2009)‎

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By Singh Hargopal   Singh Pritpal   Singh Dhanwinder   in Communications in Soil Science and Plant Analysis

ISSN:0010-3624|44|22|3483-3505

Taylor & Francis Ltd‎(2013)‎

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By Aulakh Milkha S.   Singh Dhanwinder   Sadana Upkar S.   in Journal of Sustainable Agriculture

ISSN:1044-0046|25|1|97-115

Haworth Press‎(2004)‎

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