John D. Ramsdell. Prettyprinting structured programs with connector lines. SIGPLAN Notices, 14(9):74-75, 1979. [doi]
@article{Ramsdell79, title = {Prettyprinting structured programs with connector lines}, author = {John D. Ramsdell}, year = {1979}, doi = {10.1145/988113.988123}, url = {https://doi.org/10.1145/988113.988123}, researchr = {https://researchr.org/publication/Ramsdell79}, cites = {0}, citedby = {0}, journal = {SIGPLAN Notices}, volume = {14}, number = {9}, pages = {74-75}, }