@conference {, title = {Android application for indoor location using sensor fusion: Ultrasounds and inertial devices}, booktitle = { International Conference on Indoor Positioning and Indoor Navigation }, year = {2018}, month = {09/2018}, pages = {1-8}, publisher = {IPN}, organization = {IPN}, address = {Nantes, Francia}, doi = {10.1109/IPIN.2018.8533785}, author = {Ure{\~n}a, J. and S. Perez and Gualda, D and M.C. Perez and J. M. Villadangos} }