Rannacher, R., and S. Turek. “Simple Nonconforming Quadrilateral Stokes Element”. Numerical Methods for Partial Differential Equations, vol. 8, no. 2, 1992, pp. 97-111, https://doi.org/10.1002/num.1690080202.
Rannacher, R., & Turek, S. (1992). Simple nonconforming quadrilateral Stokes element. Numerical Methods for Partial Differential Equations, 8(2), 97-111. https://doi.org/10.1002/num.1690080202
Rannacher R, Turek S. Simple nonconforming quadrilateral Stokes element. Numerical Methods for Partial Differential Equations. 1992;8(2):97-111.