Brouwer, F. <https://pure.iiasa.ac.at/view/iiasa/1765.html>  (1987).  Evaluation of integrated environmental modelling approaches.    In:  Integrated Environmental Modelling: Design and Tools.  pp. 51-62 Netherlands: Springer.  ISBN 978-94-009-3613-3 10.1007/978-94-009-3613-3_3 <https://doi.org/10.1007/978-94-009-3613-3_3>.