1. 1
    ...HD 2777 .A633 b...
    Journal
  2. 2
    Published 1990
    ...HV 43 .S678...
    Journal
  3. 3
    ...HD 2777 .A633 lj...
    Journal
  4. 4
    Published 1973
    ...HF 5601 .F491 r...
    Journal
  5. 5
    Published 1987
    ...HF 5601 .A172 h...
    Journal
  6. 6
    Published 1987
    ...HJ 2240 .A244...
    Journal
  7. 7
    ...HJ 2240 .N277...
    Journal