@article{COCV_2006__12_2_231_0,
     author = {Khapalov, Alexander Y.},
     title = {Reachability of nonnegative equilibrium states for the semilinear vibrating string by varying its axial load and the gain of damping},
     journal = {ESAIM: Control, Optimisation and Calculus of Variations},
     pages = {231--252},
     publisher = {EDP-Sciences},
     volume = {12},
     number = {2},
     year = {2006},
     doi = {10.1051/cocv:2006001},
     mrnumber = {2209352},
     zbl = {1105.93011},
     language = {en},
     url = {http://archive.numdam.org/articles/10.1051/cocv:2006001/}
}