Muller, E. A.
Highlights of astronomy.-Vol. 4, part 2:as presented at the xvi general assembly, 1976 - D. Reidel Pub. Co. ; 1977.
Astronomy
520/525(069) IAUH
Highlights of astronomy.-Vol. 4, part 2:as presented at the xvi general assembly, 1976 - D. Reidel Pub. Co. ; 1977.
Astronomy
520/525(069) IAUH