Code for the paper:

Hjorth JJ, Sterratt DC, Cutts CS, Willshaw DJ, Eglen SJ (2015)
Quantitative assessment of computational models for retinotopic map
formation. Dev Neurobiol 75:641-66

is available at this website:

"A framework for retinotopic map formation modelling and
evaluation. Currently four models are fully supported (Gierer, Koulakov,
Whitelaw and Willshaw). There is also code to run the Grimbert and
Cang model.