JETP, Vol. 70,
No. 2,
p. 244 (February 1990)
(Russian original - ZhETF,
Vol. 97,
No. 2,
p. 439,
February 1990
)
Perturbation theory for intercenter electron exchange and superexchange with degeneracy
E.V. Orlenko, A.A. Rumyantsev
Received: April 26, 1989
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