A behavioral approach to estimation in nD systems ⁎This research was supported by the Portuguese national funding agency for science, research and technology (FCT), within the Center for Research and Development in Mathematics and Applications (CIDMA), project UID/MAT/04106/2019. Moreover, it was also partially supported by UID/EEA/00147/2019 - Research Center for Systems and Technologies funded by national funds through the FCT/MCTES through national funds (PIDDAC). Issue 2 (2020)