DUFF, G. (1967). Partial differential equations. University of Toronto Press.
Chicago-čujuhus (17. p.)DUFF, G.F.D. Partial Differential Equations. Toronto: University of Toronto Press, 1967.
MLA-čujuhus (9. p.)DUFF, G.F.D. Partial Differential Equations. University of Toronto Press, 1967.
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