Spin-Offs of the Poncet Mounting Sinnott, R. W. ; Ulver, I. ; Stine, C. W. ; Bernier, J. P. ; Gee, A. E. ; Landon, K. W. ; Krieger, D. Abstract Publication: Sky and Telescope Pub Date: 1980 Bibcode: 1980S&T....59..163S