@article {, title = {Calibration of Beacons for Indoor Environments based on a Digital Map and Heuristic Information}, journal = {Sensors}, volume = {19Volume 29}, year = {2019}, month = {2/2019}, pages = {670}, issn = {1424-8220}, doi = {10.3390/s19030670}, author = {Gualda, David and Ure{\~n}a, J. and Alcal{\'a}, Jos{\'e} and Carlos Santos} }