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	1 PHYSICAL REVIEW LETTERS
fll	Two-, Three-, and Four-Atom Exchange Effects in bq
	J. H. Hetherington and^TD. C. Wiliam sics Department, Michigan State MwNik. /•fa( home. ,Vic (Received 22 September 1975)
j '■ MM ■	e made mean-field calculations with a Hamiltonian obtained iron ■atom exchange in