I. R. Faina et al., "Expert systems within taxation: Competencies for employees", in 2020 15th Iberian Conf. on Information Systems and Technologies (CISTI), Álvaro Rocha, Bernabé Escobar Peréz, Francisco Garcia Peñalvo, Maria del Mar Miras, Ramiro Gonçalves, Ed., Sevilla, IEEE, 2020