@article{RM_1980_35_1_a7,
     author = {A. B. Levin},
     title = {Characteristic polynomials of inverse differential modules and some properties of 
},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {217--218},
     publisher = {mathdoc},
     volume = {35},
     number = {1},
     year = {1980},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1980_35_1_a7/}
}