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(2)
  1. “Twin Paradox” by Robert L. Forward, Analog Science Fiction / Science Fact, August 1983.
    2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . written by Robert L. Forward
  2. expanded.
    “Twin Paradox” by Robert L. Forward, in Indistinguishable from Magic (Baen, September 1995).
    3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . written by Robert L. Forward