Tan, HM;    Bassett, JP;    O'Keefe, J;    Cacucci, F;    Wills, TJ;      (2015)    The development of the head direction system before eye opening in the rat.                   Curr Biol , 25  (4)   479 - 483.    10.1016/j.cub.2014.12.030 <https://doi.org/10.1016/j.cub.2014.12.030>.       Green open access