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  1. 1
    by Veliev, N. F.
    Published 1982
    Moskva : Vychislitelʹnyĭ ︠t︡sentr AN SSSR, 1982.
    50 p. : ill. ; 22 cm.
    Subjects: “...Agricultural productivity Mathematical models....”
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  2. 2
    by Kiselev, V. G.
    Published 1990
    Moskva : V︠T︡S AN SSSR, 1990.
    21, [1] p. : ill. ; 22 cm.
    Subjects: “...Agricultural productivity Mathematical models....”
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