Radonjic, V., A. Kostic Ljubisavljevic, and M. Stojanovic. 2012. “Quality of Experience and Users Elasticity Considerations for Modelling Competition Between Service Providers in NGN”. Elektronika Ir Elektrotechnika 18 (8):113-16. https://doi.org/10.5755/j01.eee.18.8.2640.