1. 1
    Published 1967
    Conference Proceeding Book
  2. 2
    by Hirshberg, Matthew S.
    Published 1993
    Book
  3. 3
    by Wittkopf, Eugene R., 1943-
    Published 1990
    Book
  4. 4
    Book
  5. 5
    by Gibert, Stephen P.
    Published 1977
    Book
  6. 6
    by Holsti, Ole R.
    Published 1996
    Book