URLDate
Verified		Extra Software
Requirements
(if any)		Access
Conditions		Notes
http://dx.doi.org/10.1016/0378-3774(93)90010-8DOI Link
http://ac.els-cdn.com/0378377493900108/1-s2.0-0378[...]11/14/2016PDF REaderItem is within a limited-access website
http://www.sciencedirect.com/science/article/pii/0[...]04/02/2014Item is within a limited-access website