By Hughes P.   Harper F.   Zimmerman M.   Scott S.   in European Journal of Plant Pathology

ISSN:0929-1873|113|3|309-313

Springer Publishing Company ‎(2005)‎

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By Chen Yan   Harper F. Maxwell   Konstan Joseph   Xin Li Sherry   in The American Economic Review

ISSN:0002-8282|100|4|1358-1398

American Economic Association‎(2010)‎

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By Smith P.N.   Cobb G.P.   Harper F.M.   Adair B.M.   McMurry S.T.   in Environmental Pollution

ISSN:0269-7491|119|2|261-268

Elsevier‎(2002)‎

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