The path below lists the collaborations connecting Kristofer Coward to Paul Erdos along the shortest path known to Kris. In the event that a pair of authors have collaborated more than once, their earliest collaboration (well at least the earliest to appear on MathSciNet) is listed.

1. Coward, K. T.; Elliott, G. A.; Ivanescu, C. "The Cuntz semigroup as an invariant for C*-algebras", J. Reine Agnew. Math. 623 (2008), 161--193
2. Elliott, G. A.; Handelman, D. E. "Extending traces to factorial traces", Math. Scand. 49 (1981), no. 1, 95--98.
3. Handelman, D. E.; Higgs, D.; Lawrence, J. "Directed abelian groups, countably continuous rings, and Rickart C*-algebras", J. London Math. Soc. (2) 21 (1980), no. 2, 193--202.
4. Baumgartner, J. E.; Erdos, P.; Higgs, D. "Cross-cuts in the power set of an infinite set", Order 1 (1984), no. 2, 139--145