Cong, C.B., Ngan, R.T. and Long, L.B. 2018. Some New De Morgan Picture Operator Triples in Picture Fuzzy Logic. Journal of Computer Science and Cybernetics. 33, 2 (Jan. 2018), 143–164. DOI:https://doi.org/10.15625/1813-9663/33/2/10706.