1. 1
    ...HQ 74 .B621...
    Journal
  2. 2
    ...HV 53 .A188...
    Journal
  3. 3
    Published 1990
    ...HT 169 .N52 .W4 .O84...
    Serial
  4. 4
    Published 1996
    ...HF 5318.5 .A3 .W452...
    Journal