@article{ISU_2020_20_2_a1,
     author = {P. V. Danchev},
     title = {Symmetrization in clean and nil-clean rings},
     journal = {Izvestiya of Saratov University. Mathematics. Mechanics. Informatics},
     pages = {154--160},
     publisher = {mathdoc},
     volume = {20},
     number = {2},
     year = {2020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ISU_2020_20_2_a1/}
}