1. Mathur, S., Kaul, S., Gruteser, M., Trappe, W.: ParkNet: a mobile sensor network for harvesting real time vehicular parking information. In: Proceedings of 2009 MobiHoc S3 Work, MobiHoc S3 2009, p. 25, May 2009
2. White, P.: No Vacancy: Park Slope’s Parking Problem. Transportation Alternatives. Transalt.org (2017). https://www.transalt.org/news/releases/126 , https://www.transalt.org/newsroom/releases/126 . Accessed 31 July 2017
3. San Francisco Park website. http://sfpark.org/
4. Nick, T.: Did you know how many different kinds of sensors go inside a smartphone? Phone Arena (2017). http://www.phonearena.com/news/Did-you-know-how-many-different-kinds-of-sensors-go-inside-a-smartphone_id57885 . Accessed 24 May 2017
5. Kłosowski, M., Wójcikowski, M., Czyzewski, A.: Vision-based parking lot occupancy evaluation system using 2D separable discrete wavelet transform. Bull. Polish Acad. Sci. Tech. Sci. 63(3), 569–573 (2015)