t / t4034 / bibtex / preon commit t: add means to disable '-x' tracing for individual test scripts (5fc98e7)
   1@article{aldous1987uie,
   2  title={{Ultimate instability of exponential back-off protocol for acknowledgment-based transmission control of random access communication channels}},
   3  author={Aldous, D.},
   4  journal={Information Theory, IEEE Transactions on},
   5  volume={33},
   6  number={2},
   7  pages={219--223},
   8  year={1987},
   9}