Elementary Partial Differential Equations.
By Paul W. Berg and James L. McGregor. (Holden-Day Series in Mathematics.) Pp. xv + 421. (San Francisco, London and Amsterdam: Holden-Day, Inc., 1966.) $13.
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PERRY, R. More Differential Equations. Nature 216, 307 (1967). https://doi.org/10.1038/216307b0
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DOI: https://doi.org/10.1038/216307b0