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    STUDIA BIOLOGIA - Issue no. 1 / 2008  
         
  Article:   A MODEL FOR POPULATION WITH RESPECT TO THE IMMIGRATION.

Authors:  MOHAMMAD REZA MOLAEI, MAHBOOBEH MOHAMMADHASANI.
 
       
         
  Abstract:  In this paper we introduce a model for population with respect to the per capita birth and with considering the number of people who immigrate from the society and to the society. In this model the per capita birth and the immigrant percentages are time dependent. Then we get conditions which make the number of all age groups fixed.  
         
     
         
         
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