@article{10_4064_sm_59_2_133_138,
     author = {S. Rolewicz},
     title = {On universal time for the controllability of time-depending linear control systems},
     journal = {Studia Mathematica},
     pages = {133--138},
     publisher = {mathdoc},
     volume = {59},
     number = {2},
     year = {1976},
     doi = {10.4064/sm-59-2-133-138},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-59-2-133-138/}
}