@article{RM_1981_36_5_a3,
     author = {Yu. Sh. Abramov},
     title = {Extremal problems generated by spectral problems},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {135--136},
     publisher = {mathdoc},
     volume = {36},
     number = {5},
     year = {1981},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1981_36_5_a3/}
}