@article{TM_1975_134_a25,
     author = {Z. Ciesielski},
     title = {The $C(I)$ norms of orthogonal projections onto subspaces of polygonals},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {366--369},
     year = {1975},
     volume = {134},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TM_1975_134_a25/}
}