no. 2A
On K-Boolean Rings
Publications du Département de mathématiques (Lyon), no. 2A (1992), pp. 73-77. 
@article{PDML_1992___2A_73_0,
     author = {Vasantha Kandasamy, W. B.},
     title = {On $\mathrm {K}${-Boolean} {Rings}},
     journal = {Publications du D\'epartement de math\'ematiques (Lyon)},
     pages = {73--77},
     publisher = {Universit\'e Claude Bernard - Lyon 1},
     number = {2A},
     year = {1992},
     language = {en},
     url = {http://www.numdam.org/item/PDML_1992___2A_73_0/}
}
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Vasantha Kandasamy, W. B. On $\mathrm {K}$-Boolean Rings. Publications du Département de mathématiques (Lyon), no. 2A (1992), pp. 73-77. http://www.numdam.org/item/PDML_1992___2A_73_0/

[1] Jacobson, N. Structure of Rings, A.M.S. (1956). | MR