Biographical Memoirs: Volume 72
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1961 The classification of clusters of galaxies. Proc. Natl. Acad. Sci. U. S. A. 47:905–906.
1962 Some characteristics of galaxies. Astrophys. J. 135:1–10.
1964 With T. A. Matthews and M. Schmidt. A discussion of galaxies identified with radio sources. Astrophys. J. 140:35–49.
With J. S. Neff. Stellar population of the nuclear region of the Andromeda nebula. Astron. J. 69:145.
1965 With J. R. Lesh. The supergiant galaxies. Astrophys. J. 142:1364–65.
1968 A comparison of the optical forms of certain Seyfert galaxies with the N-type radio galaxies. Astrophys. J. 153:27–30.
1969 With D. E. Osterbrock. On the classification of the forms and the stellar content of galaxies. Astron. J. 74:515–24.
1970 With L. P. Bautz. On the classification of the forms of clusters of galaxies. Astrophys. J. Lett. 162:L149–53.
1971 A unitary classification for N galaxies. Astron. J. 76:1000–1002
With N. R. Walborn and J. W. Tapscott. An optical form morphology of Seyfert galaxies. Pontif. Acad. Sci. Scr. Var. 35:27–40.
1973 With P. C. Keenan. Spectral classification. Annu. Rev. Astron. Astrophys. 11:29–50.
1977 With S. Kayser and R. A. White. cD galaxies in poor clusters. Astrophys. J. 199:545–48.