https://catalogue-scientifique.canada.ca/record=3345888~S6*frc
Rechercher Chaudhri, M. N; Rechercher Vegter, I. H; Rechercher De Wai, C. M; Rechercher Stafleu, Frans A
Published with financial support of I.U.B.S. by A. Oosthoek's Uitgeversmaatschappij N.V. for the International Bureau for Plant Taxonomy and Nomenclature of the International Association for Plant Taxonomy, 1972, ISBN : 9060460790
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