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3. Report NA 70.11;B. Bjurel,1972
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5. J.P. HENNART, “On the implementation of finite elements for parabolic evolution problems”, to appear in The Mathematics of Finite Elements and Applications IV, MAFELAP 1981, J.R. Whiteman, Ed., Academic Press, London. Also available as Comunicaciones Técnicas, Série NA, No 264 IIMAS-UNAM (1981)