@article{10_4064_cm_18_1_143_146,
     author = {S. Brzychczy},
     title = {On a certain property of a transformation in {Hilbert} space in connection with the theory of differential equations},
     journal = {Colloquium Mathematicum},
     pages = {143--146},
     publisher = {mathdoc},
     volume = {18},
     number = {1},
     year = {1967},
     doi = {10.4064/cm-18-1-143-146},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-18-1-143-146/}
}