Mitchell, J.;    Canavan, B.;    Smith, J.;      (2009)    Problem-based learning in communication systems: student perceptions and achievement.                   IEEE Transactions on Education , 53  (4)   pp. 587-594.    10.1109/TE.2009.2036158 <https://doi.org/10.1109/TE.2009.2036158>.       Green open access