Theoretical Study on the Low-Lying Electronic States of He
2
, He
+
2
, and He
++
2
2012 ◽
Vol 57
(6)
◽
pp. 1048-1052
◽
2021 ◽
pp. 107709
1983 ◽
Vol 98
(5)
◽
pp. 433-438
◽
2020 ◽
Vol 32
(5)
◽
pp. 2036-2043
◽