David J. Haglin's Erdös Number

My currently best (lowest) known Erdös Number is three (3) as can be seen by the following citations:

Erdös, Frankl, Kleitman, Saks, and Szekely, ``Sharpening the LYM Inequality'', Combinatorica 12 (1992).
Afek, Yehuda, Baruch Awerbuch, Serge Plotkin and Michael Saks, ``Local management of a global resource in a communication network'', Journal of the ACM 43 (1996), no. 1, 1-19.
Fischer, T., A.V. Goldberg, D.J. Haglin, and S. Plotkin, ``Approximating Matchings in Parallel'', Information Processing Letters 46 (1993), 115-118.