Finite speed of propagation for the porous media equation with lower order terms
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Department E.S.A.F., University of Palermo, Viale delle Scienze, 90128 Palermo
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Department of Mathematics, University of Catania, Viale A. Doria 6, 95125 Catania
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Institute of Applied Mathematics and Mechanics, National Academy of Sciences of Ukraine, Roza Luxemburg st.74, 340114 Donetsk