KERYAN, K.A. AN EXAMPLE OF DOUBLE FOURIER–HAAR SERIES WITH A NONREGULAR SUBSERIES. Proceedings of the YSU A: Physical and Mathematical Sciences, Yerevan, Armenia, v. 51, n. 1 (242), p. 18–21, 2017. DOI: 10.46991/PYSU:A/2017.51.1.018. Disponível em: https://journals.ysu.am/index.php/proceedings-phys-math/article/view/vol51_no1_2017_pp018-021. Acesso em: 22 jul. 2024.