@article{JMAG_2003_10_3_a3,
     author = {Valerii Dryuma},
     title = {The {Riemann} extensions in theory of differential equations and their applications},
     journal = {\v{Z}urnal matemati\v{c}eskoj fiziki, analiza, geometrii},
     pages = {307--325},
     year = {2003},
     volume = {10},
     number = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JMAG_2003_10_3_a3/}
}