TY - JOUR AU - Khapalov, A. Y. TI - Approximate Controllability Properties of the Semilinear Heat Equation With Lumped Controls JO - International Journal of Applied Mathematics and Computer Science PY - 1999 SP - 751 EP - 765 VL - 9 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/IJAMCS_1999_9_4_a0/ LA - en ID - IJAMCS_1999_9_4_a0 ER -