@conference {,
	title = {Analysis of performance of Ultrasonic Local Positioning Systems for 3D Spaces},
	booktitle = {2017 International Conference on Indoor Positioning Systems.},
	volume = {1},
	year = {2017},
	month = {09/2017},
	pages = {1-10},
	author = {K. Mannay and Ure{\~n}a, J. and {\'A}lvaro Hern{\'a}ndez and Gualda, D and Jos{\'e} Manuel Villadangos}
}
