A remark on two dimensional periodic potentials
1982 ◽
Vol 57
(1)
◽
pp. 130-134
◽
1993 ◽
Vol 47
(19)
◽
pp. 13019-13022
◽
2008 ◽
Vol 790
(3)
◽
pp. 414-431
◽
1993 ◽
Vol 5
(37)
◽
pp. 6971-6982
◽
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