@article{TRSPY_2012_278_a1,
     author = {P. M. Akhmet'ev},
     title = {Quadratic helicities and the energy of magnetic fields},
     journal = {Informatics and Automation},
     pages = {16--28},
     publisher = {mathdoc},
     volume = {278},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_2012_278_a1/}
}