1. Boushehrinejadmoradi N. Ganapathy V. Nagarakatte S. et al.: ‘Testing cross-platform mobile app development frameworks’.2015 30th IEEE/ACM Int. Conf. on Automated Software Engineering (ASE) Lincoln NE USA November2015 pp.441–451
2. IDC.: ‘Smartphone OS market share 2017 Q1’.2017. Available athttps://www.idc.com/promo/smartphone-market-share/os accessed 17 April 2019
3. Gartner.: ‘Gartner says worldwide sales of smartphones grew 9 percent in first quarter of 2017’.2017. Available athttps://www.gartner.com/newsroom/id/3725117 accessed 17 April 2019
4. Statista.: ‘Number of apps available in leading app stores as of march 2017’. Available athttp://www.statista.com/statistics/276623/number-of-apps-available-in-leading-app-stores/ accessed 17 April2019
5. IBM.: ‘Native web or hybrid mobile-app development’. Somers NY. Available atftp://public.dhe.ibm.com/software/pdf/mobile-enterprise/WSW14182USEN.pdf accessed 17 April2019