%0 Journal Article %A P. V. Bibikov %T Differential Invariants and Problems of Contact and Point Equivalence of Functions on $n$-Jet Spaces $J^n\mathbb R$ %J Matematičeskie zametki %D 2015 %P 150-153 %V 97 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZM_2015_97_1_a14/ %G ru %F MZM_2015_97_1_a14