Mohamed El Azzouzi
      Remarks on the approximate positive for Lotka-McKendrick system by positive birth control
      International Journal of Mathematical Analysis, Vol. 9, 2015, no. 41, 2003-2010
      http://dx.doi.org/10.12988/ijma.2015.55153

Copyright © 2015 Mohamed El Azzouzi. This article is distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.