$a Genetic variation in the "Japanese apogamous form" of the fern Asplenium unilaterale Lam. / Yasuyuki Watano and Kunio Iwatsuki. - Tokyo, 1988. // The Botanical Magazine [Vol.] 101 (1988). $b (Botanical Gardens, Faculty of Science, University of Tokyo)
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$a Flora of Thailand. Vol. 3, Pt. 1, Pteridophytes / M. Tagawa, K. Iwatsuki. - Bangkok, 1979.