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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.

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1965 With J. R. Lesh. The supergiant galaxies. Astrophys. J. 142:1364–65.

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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

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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.

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