@article{ZNSL_2009_373_a12,
     author = {I. N. Parasidis and P. C. Tsekrekos and T. G. Lokkas},
     title = {Correct and selfadjoint problems with cubic operators},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {194--209},
     publisher = {mathdoc},
     volume = {373},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2009_373_a12/}
}