HORKOFF, J., AYDEMIR, F.B., CARDOSO, E., LI, T., MATÉ, A., PAJA, E., SALNITRI, M., PIRAS, L., MYLOPOULOS, J. and GIORGINI, P. 2019. Goal-oriented requirements engineering: an extended systematic mapping study. Requirements engineering [online], 24(2), pages 133-160. Available from: https://doi.org/10.1007/s00766-017-0280-z