Não informado. (1981). Nordic Journal of Botany. Council for Nordic Publications in Botany.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Nordic Journal of Botany. Copenhagen: Council for Nordic Publications in Botany, 1981.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Nordic Journal of Botany. Council for Nordic Publications in Botany, 1981.
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