Teixeira, I. L. & Paiva, I. S. (2018). Electronic commerce and actual problems of taxation: the key underlying issues. In Pedro Isaias, Luísa Cagica Carvalho (Ed.), User innovation and the entrepreneurship phenomenon in the digital economy (pp. 72?90). IGI Global. https://doi.org/10.4018/978-1-5225-2826-5.ch004