1992A&AS...93..359D
1992A&AS...93..359D
1992A&AS...93..359D
1992A&AS...93..359D
1992A&AS...93..359D
1992A&AS...93..359D
1992A&AS...93..359D
1992A&AS...93..359D
1992A&AS...93..359D
1992A&AS...93..359D
1992A&AS...93..359D
1992A&AS...93..359D
1992A&AS...93..359D