@article{ARM_2004__40_1_a7,
     author = {Tryhuk, V\'aclav and Dlouh\'y, Old\v{r}ich},
     title = {The moving frames for differential equations. {II.} {Underdetermined} and functional equations},
     journal = {Archivum mathematicum},
     pages = {69--88},
     publisher = {mathdoc},
     volume = {40},
     number = {1},
     year = {2004},
     mrnumber = {2054874},
     zbl = {1117.34058},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_2004__40_1_a7/}
}