@article{ZNSL_1999_259_a7,
     author = {A. I. Nazarov},
     title = {About {\textquotedblleft}one-dimensionality{\textquotedblright} of the extremal in the {Poincare} inequality in the square},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {167--181},
     year = {1999},
     volume = {259},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1999_259_a7/}
}