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http://www.editthis.info/rickyrab/Cervero_(1990)
http://www.editthis.info/rickyrab/Litman_(2005)
http://www.editthis.info/rickyrab/Lehr_and_Associates_et_al._(1994)
http://www.editthis.info/rickyrab/Parkhurst_(1996)
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