References
J. Swift, Building a green roof. (http://www.bbc.co.uk/gardening/design/projects/gardenstructures_index.shtml).
L. Velazquez, Sky Gardens: Travels in Landscape Architecture. May 2004. (http//:greenroofs.com/archives/sg_may-jul04.htm).
E. Snodgrass. Frequently Asked Questions. (http://www.greenroofs.com/Greenroofs101/faqs.htm).
(greenroofs.com)
http://www.youtube.com/watch?v=NvJQ4LDz-D0&feature=related
http://www.youtube.com/watch?v=7zCyyF01CL4&feature=user
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