TY - CHAP U1 - Konferenzveröffentlichung A1 - Al-Akkad, Amro A1 - Ramirez, Leonardo A1 - Boden, Alexander A1 - Randall, Dave W. A1 - Zimmermann, Andreas T1 - Help beacons: design and evaluation of an ad-hoc lightweight s.o.s. system for smartphones T2 - CHI Conference on Human Factors in Computing Systems, CHI'14, Toronto, ON, Canada, April 26 - May 01, 2014 SN - 978-1-4503-2473-1 SB - 978-1-4503-2473-1 U6 - https://doi.org/10.1145/2556288.2557002 DO - https://doi.org/10.1145/2556288.2557002 SP - 1485 EP - 1494 S1 - 10 PB - ACM ER -