@article{IJAMCS_1999_9_4_a0,
     author = {Khapalov, A. Y.},
     title = {Approximate {Controllability} {Properties} of the {Semilinear} {Heat} {Equation} {With} {Lumped} {Controls}},
     journal = {International Journal of Applied Mathematics and Computer Science},
     pages = {751--765},
     publisher = {mathdoc},
     volume = {9},
     number = {4},
     year = {1999},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IJAMCS_1999_9_4_a0/}
}