Izuki, M., E. Nakai, and Y. Sawano. “Wavelet Characterization and Modular Inequalities for Weighted Lebesgue Spaces With Variable Exponent”. Annales Fennici Mathematici, vol. 40, no. 2, Aug. 2015, pp. 551-7, doi:10.5186/aasfm.2015.4032.