modelling
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Google SketchUp
SketchUp is a simple but powerful tool for quickly and easily creating, viewing and modifying your 3D ideas.saved at 28.04.2006, by cubicgarden, 9 UsersHow and why I model
saved at 15.10.2010, by djuggler, 2 UsersA Practical Guide to Ecological Modelling
website with r-examples for this bookmathematical modellingsaved at 23.06.2009, by kohlman, 1 User