@article{VMUMM_1986_5_a11,
     author = {R. Yu. Nabokov},
     title = {Estimates of the first eigenvalue for the fourth order elliptic equation},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {56--58},
     year = {1986},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1986_5_a11/}
}