CL-I, an environment for a compiler. - Thomas E. Cheatham Jr.; G. O. Collins Jr.; Gene F. Leonard (Commun. ACM, 1961)

Automatic programming and compilers I: Control techniques in the CL - II Programming System. - Gene F. Leonard (ACM National Conference, 1962)

An environment for an operating system. - Gene F. Leonard; John R. Goodroe (ACM National Conference, 1964)

More on extensible machines. - Gene F. Leonard; John R. Goodroe (Commun. ACM, 1966)