@article{BASM_2004_2_a9,
     author = {A. I. Kashu},
     title = {On natural classes of $R$-modules in the language of ring~$R$},
     journal = {Buletinul Academiei de \c{S}tiin\c{t}e a Republicii Moldova. Matematica},
     pages = {95--101},
     publisher = {mathdoc},
     number = {2},
     year = {2004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BASM_2004_2_a9/}
}