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  1. 1
    Book
    by Roy, K. K.
    Published 1960
  2. 2
    Book
    by Vũ Th{u00B4}ê Ngọc
    Published 1987
  3. 3
  4. 4
    Book
    Published 1954
  5. 5
    Journal
    Published 1926
  6. 6
    Book
    by Hainsworth, Ernest
    Published 1952