@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/