http://www.polymagnet.com/media/Polymagnet-White-Paper-2-Smart-Magnets-for-Smart-Product-Design.pdf
http://www.polymagnet.com/media/WP-PolyMagnets-Advanced.pdf
http://www.polymagnet.com/media/Polymagnet-White-Paper-3-Smart-Magnets-for-Precision-Alignment.pdf