American Journal of Mathematics, Vol. 101, No. 4 (Aug., 1979), pp. 743-759 (17 pages) The elementary functions of a complex variable z are those functions built up from the rational functions of z by ...

Proceedings of the National Academy of Sciences of the United States of America, Vol. 62, No. 3 (Mar. 15, 1969), pp. 668-670 (3 pages) ...