Geodesic
On the Schr\"odinger equation for helium atom
Fundamentalʹnaâ i prikladnaâ matematika, Tome 6 (2000) no. 3, pp. 841-858.

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An original method is proposed for searching for the formal solution of the Hylleraas equation. It allows not only to confirm a majority of results obtained earlier and scattered in special literature, but also to develop simple subroutines for further numerical calculations of energy levels and approximate wave functions. 
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     author = {Yu. V. Popov and L. U. Ancarani},
     title = {On the {Schr\"odinger} equation for helium atom},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {841--858},
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     number = {3},
     year = {2000},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2000_6_3_a14/}
}
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Yu. V. Popov; L. U. Ancarani. On the Schr\"odinger equation for helium atom. Fundamentalʹnaâ i prikladnaâ matematika, Tome 6 (2000) no. 3, pp. 841-858. http://geodesic.mathdoc.fr/item/FPM_2000_6_3_a14/