1. 1
    Published 1994
    ...HD 69 .P6 .E607...
    Book
  2. 2
    Published 1993
    ...HD 75.6 .B979...
    Conference Proceeding Book
  3. 3
    by Shand, Diana R.
    Published 1994
    ...HC 79 .E5 .S528...
    Book