Bound States of Two Spin Waves in the Heisenberg Ferromagnet
1970 ◽
Vol 46
◽
pp. 61-83
◽
1966 ◽
Vol 89
(1)
◽
pp. 111-118
◽
1976 ◽
Vol 26
(3)
◽
pp. 263-269
◽
1967 ◽
Vol 5
(9)
◽
pp. l-li
◽