Researchr is a web site for finding, collecting, sharing, and reviewing scientific publications, for researchers by researchers.
Sign up for an account to create a profile with publication list, tag and review your related work, and share bibliographies with your co-authors.
Tokuji Okada, Ulrich Rembold. Proximity sensor using a spiral-shaped light-emitting mechanism. IEEE Transactions on Robotics, 7(6):798-805, 1991. [doi]
Abstract is missing.