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  1. By: Khullar, Surinder Pal, - Sharma, S S - Singh, P
    Type: Article
    In: The journal of the Bombay Natural History Society
    Volume: 80
    Date: 1983
    Page Range: 262--265
    Publication Info: Bombay Bombay Natural History Society 1886-
  2. By: Khullar, Surinder Pal,
    Type: Article
    In: American fern journal
    Volume: 66
    Date: 1976
    Page Range: 21--24
    Publication Info: [Washington, etc.] American Fern Society