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@article{NUMA_1978__31_132580, author = {H.J. Schmid}, title = {On {Cubature} {Formulae} with a {Minimal} {Number} of {Knots.}}, journal = {Numerische Mathematik}, pages = {281--298}, publisher = {mathdoc}, volume = {31}, year = {1978}, zbl = {0427.65014}, url = {http://geodesic.mathdoc.fr/item/NUMA_1978__31_132580/} }
H.J. Schmid. On Cubature Formulae with a Minimal Number of Knots.. Numerische Mathematik, Tome 31 (1978), pp. 281-298. http://geodesic.mathdoc.fr/item/NUMA_1978__31_132580/