@article{SMJ2_2020_46_2_a1,
     author = {Lezama, Oswaldo and Venegas, Helbert},
     title = {The center of the total ring of fractions},
     journal = {Serdica Mathematical Journal},
     pages = {109--120},
     publisher = {mathdoc},
     volume = {46},
     number = {2},
     year = {2020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SMJ2_2020_46_2_a1/}
}