1. 1
    Published 1963
    ...QC 994.9 .A6271...
    Conference Proceeding
  2. 2
    ...QC 994.9 .C6395 a...
    Serial
  3. 3
    ...QC 994.9 .C6395 a...
    Serial
  4. 4
    by Rietman, J. H.
    Published 1967
    ...QC 994.9 .R563 1968...
    Conference Proceeding Book
  5. 5
    by Decleir, Hugo
    Published 1971
    ...QC 994.9 .D295 1971...
    Conference Proceeding Book
  6. 6
    by Turner, J. (John)
    Published 2011
    ...QC 903.2 .P76 .T87 2011...
    Cover image
    Book