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  1. By: Osório, Balthazar
    Type: Article
    In: Jornal de sciencias mathematicas, physicas e naturaes
    Volume: 2
    Series: 2
    Date: 1891
    Page Range: 97--139
    Publication Info: Lisboa, Academia Real das Sciencias de Lisboa, 1866-1927
  2. By: Osório, Balthazar
    Type: Article
    In: Jornal de sciencias mathematicas, physicas e naturaes
    Volume: 5
    Series: 2
    Date: 1898
    Page Range: 185--202
    Publication Info: Lisboa, Academia Real das Sciencias de Lisboa, 1866-1927