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  1. By: Brouillet, Luc, - Urbatsch, Lowell - Roberts, R P
    Type: Article
    In: SIDA, contributions to botany
    Volume: 21
    Date: 2004
    Page Range: 889--900
    Publication Info: [Dallas W. F. Mahler, etc.] 1962-
  2. By: Costa, Clayton M. - Roberts, R P
    Type: Article
    In: Phytoneuron
    Volume: 2014-48
    Date: 2014
    Page Range: 1--8
    Publication Info: Fort Worth, TX Guy L. Nesom