PL/I compile time extensibility

John Nicholls. PL/I compile time extensibility. SIGPLAN Notices, 4(8):40-44, 1969. [doi]

@article{Nicholls69,
  title = {PL/I compile time extensibility},
  author = {John Nicholls},
  year = {1969},
  doi = {10.1145/1115858.1115868},
  url = {https://doi.org/10.1145/1115858.1115868},
  researchr = {https://researchr.org/publication/Nicholls69},
  cites = {0},
  citedby = {0},
  journal = {SIGPLAN Notices},
  volume = {4},
  number = {8},
  pages = {40-44},
}