@article{VKAM_2016_2_a7,
     author = {V. A. Kim},
     title = {Duffing oscillator with an external harmonic impact and derived variables fractional {Remann-Liouville,} is characterized by viscous friction},
     journal = {Vestnik KRAUNC. Fiziko-matemati\v{c}eskie nauki},
     pages = {50--54},
     publisher = {mathdoc},
     number = {2},
     year = {2016},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VKAM_2016_2_a7/}
}