@article{CRMATH_2016__354_3_235_0,
     author = {Dai, Li-Xia and Chen, Yong-Gao},
     title = {On two problems of {Ljuji\'c} and {Nathanson}},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {235--238},
     publisher = {Elsevier},
     volume = {354},
     number = {3},
     year = {2016},
     doi = {10.1016/j.crma.2016.01.007},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.crma.2016.01.007/}
}