R. J. Bilro and S. M. Loureiro, "Clarifying customer brand engagement boundaries: A systematic literature review approach", in 6th Int. M-Sphere Conf. For Multidisciplinarity in Business and Science: Book of Abstracts, Tihomir Vranešević, Claudia Seabra, Doris Peručić, Miroslav Mandić, Irena Pandža, Ed., Viseu, Accent, 2017