1. 1
    Published 1990
    ...HC 670 .E5 .T323...
    Journal
  2. 2
    Published 1977
    ...HC 625 .E5 .N532 n...
    Journal
  3. 3
    Published 1989
    ...HC 670 .E5 .N558...
    Journal
  4. 4
    Published 1975
    ...HC 79 .E5 .A1 .E61 n...
    Journal
  5. 5
    Published 2001
    ...HT 395 .N52 .C2 .C229 pcnr 2002 n...
    Journal
  6. 6
    ...HC 670 .E5 .N558...
    Journal
  7. 7
    Published 2001
    ...HC 661 .A5 .M922...
    Journal
  8. 8
    ...HC 79 .E5 .I619...
    Journal
  9. 9
    Published 1971
    ...HC 681 .A1 .S726...
    Conference Proceeding Journal