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}}