@article{SF_1994__48_3_135327,
     author = {A.V. Mikhalev and U. Knauer and K.I. Beidar},
     title = {An example of two von {Neumann} regular rings with nonisomorphic {Monta} equivalent multiplicative semigroups.},
     journal = {Semigroup forum},
     pages = {381--384},
     publisher = {mathdoc},
     volume = {48},
     number = {3},
     year = {1994},
     zbl = {0803.16009},
     url = {http://geodesic.mathdoc.fr/item/SF_1994__48_3_135327/}
}