1. 1
    Published 1991
    ...HD 6958.5 .L125...
    Journal
  2. 2
    Published 1960
    ...HF 5801 .J86...
    Journal
  3. 3
    ...HF 5601 .A172 b...
    Journal
  4. 4
    Published 1982
    ...H 29 .S471...
    Serial