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References
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.. rubric:: References
.. [Toe2017] Toe D., Bourrier F., Olmedo I., Monnet J.-M., Berger F.:"Analysis of the effect of trees on block propagation using a DEM model: implications for rockfall modelling". Landslides, 14 (5), pp. 1603-1614. 
.. [Bourrier2012] Bourrier F., Berger F., Tardif P., Dorren L., Hungr O.:"Rockfall rebound: Comparison of detailed field experiments and alternative modelling approaches". Earth Surface Processes and Landforms, 37 (6), pp. 656-665.
.. [Bourrier2011] Bourrier F., Hungr O.: "Rockfall dynamics, a critical review of collision and rebound models". Rockfall engineering, from prediction to mitigation, ISTE Wiley 175-203.
.. [Pfeiffer1989] Pfeiffer T.J., Bowen T.D.: "Computer simulation of rockfalls". Bulletin - Association of Engineering Geologists, 26 (1), pp. 135-146.