@article{GDZPPN001186655, title = {Interpolation by periodic splines with Birkhoff knots.}, journal = {Numerische Mathematik}, volume = {66}, year = {1993}, pages = {63-76}, zbl = {0795.41002}, url = {http://dml.mathdoc.fr/item/GDZPPN001186655} }
Bojanov, Borislav. Interpolation by periodic splines with Birkhoff knots.. Numerische Mathematik, Tome 66 (1993) pp. 63-76. http://gdmltest.u-ga.fr/item/GDZPPN001186655/