The piecewise-polynomial approximation in W21 of functions from Wp2 , 1
1978 ◽
Vol 18
(4)
◽
pp. 114-121
1984 ◽
Vol 40
(4)
◽
pp. 327-332
◽
2018 ◽
Vol 40
(2)
◽
pp. B507-B527
◽
2014 ◽
Vol 420
(2)
◽
pp. 1069-1094
◽
1976 ◽
Vol 13
(12)
◽
pp. 715-721
◽