Aleksandr V. Krivoshein. Hexagonally symmetric orthogonal filters with $\sqrt{3}$ refinement. Multidim. Syst. Sign. Process., 32(1):217-238, 2021. [doi]
@article{Krivoshein21,
title = {Hexagonally symmetric orthogonal filters with $\sqrt{3}$ refinement},
author = {Aleksandr V. Krivoshein},
year = {2021},
doi = {10.1007/s11045-020-00735-y},
url = {https://doi.org/10.1007/s11045-020-00735-y},
researchr = {https://researchr.org/publication/Krivoshein21},
cites = {0},
citedby = {0},
journal = {Multidim. Syst. Sign. Process.},
volume = {32},
number = {1},
pages = {217-238},
}