On the optimal approximation rates for criss-cross finite element spacesWolfgang DahmenCharles A. Micchelli1984J. Comput. Appl. Math.
Hopscotch methods for elliptic partial differential equationsA.R. GourlayS. McKee1979J. Comput. Appl. Math.
The construction of hopscotch methods for parabolic and elliptic equations in two space dimensions with a mixed derivativeA.R. GourlayS. McKee1977J. Comput. Appl. Math.