1. 1
    Published 1990
    ...HC 683.5 .P218 d...
    Journal
  2. 2
    Published 1992
    ...HC 683.5 .P218 d...
    Serial
  3. 3
    Published 1993
    ...HC 683.5 .Z9 .E5 .G721...
    Conference Proceeding Book
  4. 4
  5. 5
    Published 1988
    ...HC 683.5 .Z9 .E5 .C758...
    Conference Proceeding Journal
  6. 6
    Published 2010
    ...HD 9502 .N425 .E545 2010...
    Book