1. Baker, G. A., Jr. (1975).Essentials of Pad� Approximatits, Academic Press, p. 10.
2. Fleischer, J., Pindor, M., Raczka, P. A., and Raczka, R. (1990). What may be expected from perturbative QCD in four-loop order and beyond, inProceedings of the XII Warsaw Symposium on Elementary Particle Physics, Kazimierz, Poland (May 29?June 2, 1989), Z. Ajduk, S. Pokorski, and A. K. Wroblewski, eds., World Scientific.
3. Kleinert, H., Neu, J., Schulte-Frohlinde, V., Chetyrkin, K. G., and Larin, S. A. (1991).Physics Letters B,272, 39.
4. Samuel, M. A., Li, G., and Steinfelds, E. (1992). PA and the R and R? ratios in PQCD, Fermilab Pub 92/200-T (July 1992).
5. Samuel, M. A., Li, G., and Steinfelds, E. (1993).Physical Review D,48, 869.