Primary source. Published 2007. Relevant locator: Abstract; Network 18, pp. 161–187, changing object repertoire and trace learning with multiple objects.
Primary source. Published 2006. Relevant locator: Abstract and Introduction, pp. 128–131; experiments 3–4 distinguish spatial overlap from temporal ordering.
Primary source. Published 2008. Relevant locator: Abstract; Neural networks 21, pp. 888–903, competitive networks and rotating 3D objects.