Christopher A. Stone, Robert Harper. Extensional equivalence and singleton types. ACM Trans. Comput. Log., 7(4):676-722, 2006. [doi]
@article{StoneH06,
title = {Extensional equivalence and singleton types},
author = {Christopher A. Stone and Robert Harper},
year = {2006},
doi = {10.1145/1183278.1183281},
url = {http://doi.acm.org/10.1145/1183278.1183281},
researchr = {https://researchr.org/publication/StoneH06},
cites = {0},
citedby = {0},
journal = {ACM Trans. Comput. Log.},
volume = {7},
number = {4},
pages = {676-722},
}