@article{forkes2007nitrogen, title = {Nitrogen balance for the urban food metabolism of Toronto, Canada} author = {Forkes, Jennifer}, journal = {Resources, Conservation and Recycling}, url = {http://www.sciencedirect.com/science/article/pii/S0921344907000468}, doi = {10.1016/j.resconrec.2007.02.003}, year = {2007} }