@article{10_4153_CMB_1971_036_x,
     author = {Sankaran, N.},
     title = {Rings of {Formal} {Power} {Series}},
     journal = {Canadian mathematical bulletin},
     pages = {207--220},
     year = {1971},
     volume = {14},
     number = {2},
     doi = {10.4153/CMB-1971-036-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1971-036-x/}
}