MODELING OF VERTICAL HANDOVER FROM 3GPP LTE TO COGNITIVE WIRELESS REGIONAL AREA NETWORK Article Alexander G., Yuliya G., Elvira Z., Anatoly P. 9th International Congress on Ultra Modern Telecommunications and Control Systems and Workshops, ICUMT 2017. Munich, Germany, November 6-8, 2017.. IEEE. Vol. 2017-November. 2018. P. 1-6