Spectral Classification with Objective-Prism Spectra from Skylab Henize, K. G. ; Parsons, S. B. ; Wray, J. D. ; Benedict, G. F. Abstract Publication: Highlights of Astronomy Pub Date: 1977 DOI: 10.1017/S1539299600003506 Bibcode: 1977HiA.....4B.315H