1. 1
    Published 1985
    ...HG 51 .T835...
    Journal
  2. 2
    Published 1990
    ...H 1 .F771...
    Journal
  3. 3
    Published 1998
    ...H 1 .F771...
    Journal
  4. 4
    Published 1998
    ...HN 49 .C6 .O94...
    Journal