@article{MM2_1975__15_154320,
     author = {John W. Petro},
     title = {Concerning {Filtrations} on {Commutative} {Rings.}},
     journal = {Manuscripta mathematica},
     pages = {261--274},
     publisher = {mathdoc},
     volume = {15},
     year = {1975},
     zbl = {0305.13011},
     url = {http://geodesic.mathdoc.fr/item/MM2_1975__15_154320/}
}