@article{TMF_2020_204_3_a0,
     author = {C. M. Chanu and G. Rastelli},
     title = {Extensions of nonnatural {Hamiltonians}},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {321--331},
     year = {2020},
     volume = {204},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2020_204_3_a0/}
}