@article{Fardigola_Khalina_2007, title={Controllability problems for the string equation}, volume={59}, url={https://umj.imath.kiev.ua/index.php/umj/article/view/3358}, abstractNote={For the string equation controlled by boundary conditions, we establish necessary and sufficient conditions for 0-and ε-controllability. The controls that solve such problems are found in explicit form. Moreover, using the Markov trigonometric moment problem, we construct bangbang controls that solve the problem of ε-controllability.}, number={7}, journal={Ukrains’kyi Matematychnyi Zhurnal}, author={Fardigola, L. V. and Khalina, K. S.}, year={2007}, month={Jul.}, pages={939–952} }