Kerry A. Landman Matthew J. Simpson J. L. Slater Donald F. Newgreen Diffusive and Chemotactic Cellular Migration: Smooth and Discontinuous Traveling Wave Solutions. 1420-1442 2005 65 SIAM Journal of Applied Mathematics 4 http://dx.doi.org/10.1137/040604066 db/journals/siamam/siamam65.html#LandmanSSN05