@article{MZM_1993_53_1_a9,
     author = {G. E. Puninskii},
     title = {$RD$-formulas and $W$-rings},
     journal = {Matemati\v{c}eskie zametki},
     pages = {95--103},
     year = {1993},
     volume = {53},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1993_53_1_a9/}
}