Burstein, Michael A. "Broken Symmetry"
Summary: Features two parallel universes, one in which the Superconducting Super Collider was completed.
Series note: Sequel is "Absent Friends".
Published: In Analog, February 1997.

Burstein, Michael A. "Absent Friends"
Series note: Sequel to "Broken Symmetry".
Published: In Analog, September 1998.