@article{10_14708_cm_v54i2_698,
     author = {P.N. Natarajan},
     title = {The {Schur} and {Steinhaus} {Theorems} for {4-Dimensional} {Infinite} {Matrices}},
     journal = {Commentationes Mathematicae},
     pages = { 159--165},
     publisher = {mathdoc},
     volume = {54},
     number = {2},
     year = {2014},
     doi = {10.14708/cm.v54i2.698},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/cm.v54i2.698/}
}