Z. Li & X. Xu. (1970). Dyadic Bivariate Fourier Multipliers for Multi-Wavelets in $L^2(\mathbb{R}^2)$.
            <i>Analysis in Theory and Applications</i>. <i>31</i> (3).
            221-235.
         doi:10.4208/ata.2015.v31.n3.1