The Ground State of the Helium Atom by the Hylleraas Method
1972 ◽
Vol 56
(3)
◽
pp. 1219-1223
◽
2017 ◽
Vol 125
(3)
◽
pp. 369-371
1980 ◽
Vol 73
(1)
◽
pp. 122-126
◽
1969 ◽
Vol 3
(2)
◽
pp. 104-106
◽
1994 ◽
Vol 51
(3)
◽
pp. 135-140
◽