@article{1240234711, author = {SAKAI, Ryozi}, title = {Approximation problem restricted by an incidence matrix}, journal = {J. Math. Soc. Japan}, volume = {32}, number = {4}, year = {1980}, pages = { 557-585}, language = {en}, url = {http://dml.mathdoc.fr/item/1240234711} }
SAKAI, Ryozi. Approximation problem restricted by an incidence matrix. J. Math. Soc. Japan, Tome 32 (1980) no. 4, pp. 557-585. http://gdmltest.u-ga.fr/item/1240234711/