@inproceedings{Ong,
    doi = {10.1109/lics.2002.1029833},
    url = {https://doi.org/10.1109%2Flics.2002.1029833},
    publisher = {{IEEE} Comput. Soc},
    author = {C.-H.L. Ong},
    title = {Observational equivalence of 3rd-order Idealized Algol is decidable},
    booktitle = {Proceedings 17th Annual {IEEE} Symposium on Logic in Computer Science}
}

@inproceedings{Ong, doi = {10.1109/lics.2002.1029833}, url = {https://doi.org/10.1109%2Flics.2002.1029833}, publisher = {{IEEE} Comput. Soc}, author = {C.-H.L. Ong}, title = {Observational equivalence of 3rd-order Idealized Algol is decidable}, booktitle = {Proceedings 17th Annual {IEEE} Symposium on Logic in Computer Science} }