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Restricted accessResearch articleFirst published April, 1987pp. 201-206Restricted accessResearch articleFirst published April, 1987pp. 206-213Restricted accessResearch articleFirst published April, 1987pp. 213-221Restricted accessResearch articleFirst published April, 1987pp. 221-226Restricted accessResearch articleFirst published April, 1987pp. 227-234Restricted accessOtherFirst published April, 1987pp. 234-243Restricted accessOtherFirst published April, 1987pp. 244-248Restricted accessOtherFirst published April, 1987pp. 248-248
