1. Boas, R. P.: Entire Functions. New York: Academic Press 1954
2. Fricke, G. H.: Products of functions of bounded index and applications. Doctoral dissertation. Kent State University 1971
3. Fricke, G. H.: Entire functions having positive zeros. (To appear)
4. Fricke, G. H.: A characterization of functions of bounded index having positive zeros. (To appear)
5. Fricke, G. H.: Entire functions of locally slow growth. (To appear)