@article{JRAM_1991__413_153286,
     author = {R.H. jr. Martin and H.L. Smith},
     title = {Reaction-diffusion systems with time delays: monotonicity, invariance, comparison and convergence.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {1--35},
     year = {1991},
     volume = {413},
     zbl = {0709.35059},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1991__413_153286/}
}