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This work performed under the auspices of the U. S. Atomic Energy Commission.
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Eisen, D. On the numerical solution of\(u_t = u_{rr} + \frac{2}{r}u_r \) . Numer. Math. 10, 397–409 (1967). https://doi.org/10.1007/BF02162873
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DOI: https://doi.org/10.1007/BF02162873