1. 1
    ...HC 661 .E19...
    Serial
  2. 2
    ...HC 621 .N532 q...
    Journal
  3. 3
    Published 1979
    ...HD 9738 .N5 .M285...
    Journal
  4. 4
    Published 1981
    ...HB 1 .E19 n...
    Journal
  5. 5
    Published 1993
    ...HG 3530.5 .A7 .R433 .D6...
    Journal