@inproceedings{640621afb37241f9bc58159c4525f69d,
title = "Optical proximity switch as a safety sensor",
author = "Timo Malm and Ilkka Heinonen and Markku Hellsten and Heino Ruottinen",
note = "Project code: TUR0019; 12th annual symposium of the Society of Reliability Engineers : Scandinavian Chapter ; Conference date: 01-10-1991 Through 03-10-1991",
year = "1991",
language = "English",
isbn = "978-1-85166-710-9",
pages = "190--199",
editor = "Yngve Malm{\'e}n and Veikko Rouhiainen",
booktitle = "Reliability and safety of processes and manufacturing systems",
publisher = "Elsevier",
address = "Netherlands",
}