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Kim, S. G.; Lee, C. Y. Smooth Bilinear Forms of ${\mathcal L}(^2\mathbb{R}_{h(w_1, w_2)}^2)$ and ${\mathcal L}(^2\mathbb{R}_{h^{’}(w_1, w_2)}^2)$. MFAT 2023, 29 (1-2), 39-56. https://doi.org/https://doi.org/10.31392/MFAT-npu26_1--2.2023.04.