For a biography of Paul Erdös, the most prolific mathematician of all time, click here. To learn about the Erdös number, I highly recommend The Erdös Number Project. To try to trace collaborations to Erdös, try the AMS's MathSciNet tool. The photo of Erdös is taken from the American Mathematical Society website.
Entringer, R. C.; Erdös, Paul, 1972: On the number of unique subgraphs of a graph. J. Combinatorial Theory Ser. B, 13, 112--115.
Douthett, Jack; Entringer, Roger, Mullhaupt, Andrew, 1992: Musical scale construction: the continued fraction compromise. (English. English summary) Utilitas Math. 42, 97--113.
Ghil, M., Mullhaupt, A., 1985: Boolean delay equations. II. Periodic and aperiodic solutions. J. Statist. Phys., 41 (1-2), 125--173.
Zhang, Y., B. Stevens, B. Medeiros and M. Ghil, 2009:
Low cloud fraction, lower-tropospheric stability and large-scale divergence.
Journal of Climate, DOI: 10.1175/2009JCLI2891.1
Erdös, Paul; Hickerson, Dean; Pach, János: A problem of Leo Moser about repeated distances on the sphere.
Amer. Math. Monthly 96 (1989), no. 7, 569--575.
Andrews, George E., Dyson, Freeman J., Hickerson, Dean: Partitions and indefinite quadratic forms. Invent. Math. 91 (1988), no. 3, 391--407.
Happer W, MacDonald GJ, Max CE, Dyson, FJ: Atmospheric-Turbulence Compensation By Resonant Optical Backscattering From The Sodium Layer In The Upper-Atmosphere. J OPT SOC AM A 11 (1): 263-276 JAN 1994
Muller RA, MacDonald GJ: Glacial cycles and astronomical forcing. SCIENCE 277 (5323): 215-218 JUL 11 1997
Karner DB, Levine J, Medeiros BP, Muller RA
Constructing a stacked benthic delta O-18 record
PALEOCEANOGRAPHY 17 (3): art. no. 1030 JUL-AUG 2002
Entringer, R. C.; Erdös, Paul, 1972: On the number of unique subgraphs of a graph. J. Combinatorial Theory Ser. B, 13, 112--115.
Douthett, Jack; Entringer, Roger, Mullhaupt, Andrew, 1992: Musical scale construction: the continued fraction compromise. (English. English summary) Utilitas Math. 42, 97--113.
Ghil, M., Mullhaupt, A., 1985: Boolean delay equations. II. Periodic and aperiodic solutions. J. Statist. Phys., 41 (1-2), 125--173.
Zhang, Yunyan, Bjorn Stevens, and Michael Ghil, 2005: On the Diurnal Cycle and Susceptibility to Aerosol Concentration in a Stratocumulus-Topped Mixed Layer. Quart. J. Roy. Meteorol. Soc., 131, 1567-1584.
Medeiros, Brian and Alex Hall and Bjorn Stevens, 2005:
What controls the mean depth of the PBL? J. Climate, 18,
2877-2892.
Medeiros → David L. Williamson → Paul N. Swarztrauber
→ David H. Bailey → Carl Pomerance → Paul Erdős
There is also another chain: Medeiros →
Peter Hjort Lauritzen (or D.L. Williamson) → Christiane Jablonowski → Quentin
F. Stout → Frank Harary → Paul Erdős