000			00490nmm a2200145Ia 4500
008			230201s9999||||xx |||||||||||||||||und||
020			_a9783662415832
100			_aIvan Singer
245		0	_aBest Approximation in Normed Linear Spaces by Elements of Linear Subspaces
250			_a1970
260			_bSpringer Berlin Heidelberg _c1970
440			_aGrundlehren der mathematischen Wissenschaften
650			_aMathematics and Statistics
856			_uhttps://doi.org/10.1007/978-3-662-41583-2
999			_c23522 _d23522