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- [3] CHROMATOGRAPHIC AND CYTOLOGICAL STUDY OF DRYOPTERIS-DILATATA IN NORTH-AMERICA AND EASTERN ASIA CANADIAN JOURNAL OF BOTANY, 1971, 49 (02): : 247 - &
- [4] CHEMOTAXONOMIC INVESTIGATIONS ON DRYOPTERIS-CRISTATA COMPLEX IN NORTH AMERICA CANADIAN JOURNAL OF BOTANY, 1971, 49 (07): : 1141 - &