1. The lumped mass finite element method for a parabolic problem;Chen;J. Austral. Math. Soc. Ser. B,1985
2. H. Fujii, Some remarks on finite element analysis of time-dependent field problems, in: Theory and Practice in Finite Element Structural Analysis, University of Tokyo Press, Tokyo, 1973, pp. 91–106.
3. H. Fujita, On the semi-discrete finite element approximation for the evolution equation ut+A(t)u=0 of parabolic type, in: Topics in Numerical Analysis III, Academic Press, New York, 1977, pp. 143–157.
4. On the finite element method for parabolic equations, I: Approximation of holomorphic semi-groups;Fujita;J. Math. Soc. Japan,1976
5. Operator Theory and Numerical Methods;Fujita,2001