SEOP SHIM, Myeong. Implementation of mobile APP service in an electronic tax invoice. International Journal of Engineering and Technology, [S. l.], v. 7, n. 2.33, p. 171–174, 2018. DOI: 10.14419/ijet.v7i2.33.13878. Disponível em: https://sciencepubco.com/index.php/IJET/article/view/13878.. Acesso em: 11 aug. 2025.