@article{VSGTU_2014_2_a6,
     author = {K. V. Berdnikov and V. V. Struzhanov},
     title = {Potential {Fields} of {Free} {Energy} at the {Stages} of {Hardening} and {Softening} of the {Hencky} {Medium} at {Nonpositivity} of {Volume} {Deformation}},
     journal = {Journal of Samara State Technical University, Ser. Physical and Mathematical Sciences},
     pages = {82--88},
     publisher = {mathdoc},
     number = {2},
     year = {2014},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VSGTU_2014_2_a6/}
}