Efficient Oblivious Augmented Maps: Location-Based Services with a Payment Broker.

Markulf Kohlweiss Sebastian Faust Lothar Fritsch Bartek Gedrojc Bart Preneel Efficient Oblivious Augmented Maps: Location-Based Services with a Payment Broker. 77-94 2007 conf/pet/2007 Privacy Enhancing Technologies http://dx.doi.org/10.1007/978-3-540-75551-7_6 db/conf/pet/pet2007.html#KohlweissFFGP07