Zsófia Huhn Zoltán Somogyvári Tamás Kiss Péter Érdi Distance coding strategies based on the entorhinal grid cell system. 536-543 2009 22 Neural Networks 5-6 http://dx.doi.org/10.1016/j.neunet.2009.06.029 db/journals/nn/nn22.html#HuhnSKE09