@article{10_4064_cm_70_2_227_234,
     author = {A. Plichko and A. Razenkov},
     title = {On three problems from the {Scottish} {Book} connected with orthogonal systems},
     journal = {Colloquium Mathematicum},
     pages = {227--234},
     publisher = {mathdoc},
     volume = {70},
     number = {2},
     year = {1996},
     doi = {10.4064/cm-70-2-227-234},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-70-2-227-234/}
}