http://dx.doi.org/10.1016/0261-2194(85)90022-5 | | | | DOI Link |
http://ac.els-cdn.com/0261219485900225/1-s2.0-0261[...] | 08/08/2013 | PDF Reader | Item is within a limited- access website | |
http://www.sciencedirect.com/science/article/pii/0[...] | 12/15/2016 | PDF Reader | Item is within a limited-access website | |