@article{10_4064_am_17_3_473_479,
     author = {D. Niewinowska-Jacak},
     title = {Optimal control in linear systems without the condition of regular controllability},
     journal = {Applicationes Mathematicae},
     pages = {473--479},
     publisher = {mathdoc},
     volume = {17},
     number = {3},
     year = {1980},
     doi = {10.4064/am-17-3-473-479},
     zbl = {0502.49010},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/am-17-3-473-479/}
}