MathSciNet bibliographic data MR71875 65.0X Douglas, Jim, Jr. On the numerical integration of $\partial^2u/\partial x\sp 2+\partial^2u/\partial y^2=\partial u/\partial t$$\partial^2u/\partial x\sp 2+\partial^2u/\partial y^2=\partial u/\partial t$ by implicit methods. J. Soc. Indust. Appl. Math. 3 (1955), 42–65. Links to the journal or article are not yet available

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