1. W. F. Osgood, ‘‘Factorization of analytic
functions of several variables,’’ Ann. Math. 19, 77–95
(1917).
2. C. T. Chuang and C. C. Yang, Fix-Points and
Factorization of Meromorphic Functions (World Scientific,
Singapore, 1990).
3. G. N. Watson, A Treatise on the Theory of
Bessel Functions (Cambridge Univ. Press, Cambridge, 1995).
4. W. Magnus, F. Oberhettinger, and F. G. Tricomi,
Higher Transcendental Functions (Robert E. Krieger,
Malabar, 1981), Vol. 1.
5. L. Greengard and V. Rokhlin, ‘‘A fast algorithm
for particle simulations,’’ J. Comput. Phys. 135,
280–292 (1997).