OBSERVATIONS OF THE LIMB SOLAR-FLARE ON 1980 APRIL 30 WITH THE SMM X-RAY POLYCHROMATOR
ASTROPHYSICAL JOURNAL 244:3 (1981) L147-&
RESONANT EXCITATION OF MOTION PERPENDICULAR TO GALACTIC PLANES
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 196:2 (1981) 455-467
THE ACTIVE SUN
SPACE SCIENCE REVIEWS 29:4 (1981) 363-365
THE APPARENT AND TRUE ELLIPTICITIES OF GALAXIES OF DIFFERENT HUBBLE TYPES IN THE 2ND REFERENCE CATALOG
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 194:2 (1981) 679-691