1. Some elementary theorems on entire functions;Boas, R. P., Jr.;Rend. Circ. Mat. Palermo (2),1952
2. Two theorems on integral functions;Boas, R. P., Jr.;J. London Math. Soc.,1953
3. A. Edrei and W. H. J. Fuchs, Abstract 546-63, Notices Amer. Math. Soc. vol. 6 (1958) p. 371.
4. On Nevanlinna’s second theorem and extensions;Hayman, W. K.;Rend. Circ. Mat. Palermo (2),1953