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- [4] STUDIES IN CRATAEGUS (ROSACEAE, MALOIDEAE) .9. SHORT-SHOOT LEAF HETEROBLASTY IN CRATAEGUS-CRUS-GALLI-SENSU-LATO CANADIAN JOURNAL OF BOTANY-REVUE CANADIENNE DE BOTANIQUE, 1984, 62 (09): : 1775 - 1780
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