@article{JMAG_2012_8_a0,
     author = {K. S. Khalina},
     title = {On the {Neumann} boundary controllability for the non-homogeneous string on a half-axis},
     journal = {\v{Z}urnal matemati\v{c}eskoj fiziki, analiza, geometrii},
     pages = {307--335},
     publisher = {mathdoc},
     volume = {8},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JMAG_2012_8_a0/}
}