@article{1183539477,
author = {Barrow, D. L. and Chui, C. K. and Smith, P. W. and Ward, J. D.},
title = {Unicity of best $L\_2$ approximation by second-order splines with variable knots},
journal = {Bull. Amer. Math. Soc.},
volume = {83},
number = {6},
year = {1977},
pages = { 1049-1050},
language = {en},
url = {http://dml.mathdoc.fr/item/1183539477}
}
Barrow, D. L.; Chui, C. K.; Smith, P. W.; Ward, J. D. Unicity of best $L_2$ approximation by second-order splines with variable knots. Bull. Amer. Math. Soc., Tome 83 (1977) no. 6, pp. 1049-1050. http://gdmltest.u-ga.fr/item/1183539477/