1. 1
    Published 1990
    ...HC 683.5 .P218 d...
    Journal
  2. 2
    by O'Collins, Maev
    Published 1984
    ...HQ 799 .P25 .O17...
    Book
  3. 3
    Published 1993
    ...HC 683.5 .Z9 .E5 .G721...
    Conference Proceeding Book
  4. 4
    Published 1993
    ...HN 932 .A1 .P218...
    Book