m├ęthode variationnelle

1975 / A variational Hartree-type calculation / R. T. Robiscoe / American Journal of Physics 43 (1975) p. 538 [doi]
1977 / Variational method for two-electron atoms / M. K. Srivastava ; R. K. Bhaduri / American Journal of Physics 45 (1977) p. 462 [doi]
1994 / The variational method-Why stop halfway? / Marten J. ten Hoor / American Journal of Physics 62 (1994) p. 166 [doi]