Edgar T. Irons. Experience with an extensible language. Communications of the ACM, 13(1):31-40, 1970. [doi]
@article{Irons70, title = {Experience with an extensible language}, author = {Edgar T. Irons}, year = {1970}, doi = {10.1145/361953.361966}, url = {http://doi.acm.org/10.1145/361953.361966}, researchr = {https://researchr.org/publication/Irons70}, cites = {0}, citedby = {0}, journal = {Communications of the ACM}, volume = {13}, number = {1}, pages = {31-40}, }