BibTeX:
@inproceedings{Nipkow-TYPES02,author={Tobias Nipkow},
title={{Structured Proofs in Isar/HOL}},
booktitle={Types for Proofs and Programs (TYPES 2002)},
editor={H. Geuvers and F. Wiedijk},
year=2003,publisher=Springer,series=LNCS,volume=2646,pages={259-278}}