TPHOLs 2008 proceedings are published as Volume 5170 of Springer-Verlag's Lecture Notes in Computer Science.
@proceedings{tphols2008a,
editor = {Otmane Ait Mohamed, César Muñoz and Sofiène Tahar},
title = {Theorem Proving in Higher Order Logics, 21th International
Conference, TPHOLs 2008, Montreal, Canada, August
18-21, 2008, Proceedings},
booktitle = {TPHOLs},
publisher = {Springer},
series = {Lecture Notes in Computer Science},
volume = {5170},
year = {2008}
}
@techreport{tphols2008b,
title = {Theorem Proving in Higher Order Logics: Emerging Trends Proceedings},
editor = {Otmane Ait Mohamed, César Muñoz and Sofiène Tahar},
month = 08,
year = 2008,
institution = {Department of Electrical Computer Engineering, Concordia University},
number = {2008-1-Ait Mohamed}
}