![]() SEIR Model obtained Ordinary Differential Equation (ODE) non-linear System 4-D which then reduces to 3-D. Several factors affect the population in this model is vaccination, immigration and emigration that occurred in the population. Population devided by four variables, namely: Susceptible, Exposed, Infected and Recovered ( SEIR). Mathematical modelling and simulation for Hepatitis B discuss in this paper. Side, Syafruddin Irwan, Mulbar, Usman Sanusi, Wahidah 12, pealk.: President Ilves presents commemorative stone for the restoration of independence to artist Heinz Valk ![]() augustil 2007 Kadriorus kultuuritegelastele korraldatud vastuvõtul Eesti iseseisvuse taastamise mälestuskivi kunstnik Heinz Valgule. Heinz Valk sai iseseisvuse taastamise mälestuskivi ![]() augustit tuleks nimetada just iseseisvuse taastamise aastapäevaks ja mitte taasiseseisvumise päevaks President Ilves andis iseseisvuse taastamise mälestuskivi kunstnik Heinz Valgule / Kristel Peterson
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