@article{10_4153_CJM_1991_064_1,
     author = {Wu, Jianhong and Freedman, H. I.},
     title = {Monotone {Semiflows} {Generated} by {Neutral} {Functional} {Differential} {Equations} {With} {Application} to {Compartmental} {Systems}},
     journal = {Canadian journal of mathematics},
     pages = {1098--1120},
     year = {1991},
     volume = {43},
     number = {5},
     doi = {10.4153/CJM-1991-064-1},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1991-064-1/}
}