1. Campos Ferreira, M., Nóvoa, H., Galvão, T., Falcão e Cunha, J.: A proposal for a public transport ticketing solution based on customer’s mobile devices. Procedia Soc. Behav. Sci. 111, 232–241 (2014)
2. Fontes, T., Costa, V., Campos Ferreira, M., Shengxiao, L., Zhao, P., Galvão, T.: Mobile payments adoption in public transport. Transp. Res. Procedia 24, 410–417 (2017)
3. Campos Ferreira, M., Galvão, T., Falcão e Cunha, J.: Design and evaluation of a mobile payment system for public transport: the MobiPag STCP prototype. In: MOBILITY 2014: 4th International Conference on Mobile Services, Resources and Users, Iaria, Paris, pp. 71–77 (2014)
4. Rodrigues, H., José, R., Coelho, A., Melro, A., Campos Ferreira, M., Falcão e Cunha, J., Monteiro, M.P., Ribeiro, C.R.: MobiPag: integrated mobile payment, ticketing and couponing solution based on NFC. Sensors 14(8), 13389–13415 (2014)
5. Campos Ferreira M., Dias T.G.: How to encourage the use of public transport? A multiservice approach based on mobile technologies. In: Lecture Notes in Business Information Processing, vol. 201, pp. 314–325 (2015)