@article{10_4153_CMB_2016_009_0,
     author = {Ying, Zhiling and Ko\c{s}an, Tamer and Zhou, Yiqiang},
     title = {Rings in which {Every} {Element} is a {Sum} of {Two} {Tripotents}},
     journal = {Canadian mathematical bulletin},
     pages = {661--672},
     year = {2016},
     volume = {59},
     number = {3},
     doi = {10.4153/CMB-2016-009-0},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2016-009-0/}
}