http://dx.doi.org/10.1016/0169-2046(87)90040-5 | | | | DOI Link |
http://www.sciencedirect.com/science/article/pii/0[...] | 10/08/2015 | | Item is within a limited-access website | |
http://ac.els-cdn.com/0169204687900405/1-s2.0-0169[...] | 10/08/2015 | PDF Reader | Item is within a limited-access website | |