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A. Armstrong, E.J. Ling, R. Stedman, and P. Kleinman
Pág. 337 - 344
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Mike N. Patriquin, John R. Parkins and Richard C. Stedman
Pág. 65 - 74
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James, E, Kleinman, P K A, Veith, T, Stedman, R, Sharpley, A
Pág. 40 - 47
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Daniel A. Burgard, Thomas R. Dalton, Gary A. Bishop, John R. Starkey, and Donald H. Stedman
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