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[12]
GERSON F, 1970, HELV CHIM ACTA, V53, P103
[13]
GERSON F, 1970, HIGH RESOLUTION ESR, P107
[14]
GERSON F, 1971, NONBENZENOID AROMATI, V2, P81
[15]
GERSON F, 1970, HELV CHIM ACTA, V53, P95