@article{MZM_1972_11_1_a5,
     author = {A. V. Mikhalev and M. A. Shatalova},
     title = {Projective and free ordered modules},
     journal = {Matemati\v{c}eskie zametki},
     pages = {41--52},
     publisher = {mathdoc},
     volume = {11},
     number = {1},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1972_11_1_a5/}
}