David Peebles Clare Davies Rodrigo Mora Effects of Geometry, Landmarks and Orientation Strategies in the 'Drop-Off' Orientation Task. 390-405 2007 conf/cosit/2007 COSIT http://dx.doi.org/10.1007/978-3-540-74788-8_24 db/conf/cosit/cosit2007.html#PeeblesDM07