@article{FAA_1992_26_2_a6,
     author = {M. S. Agranovich},
     title = {On modules of eigenvalues for non-self-adjoint {agmon{\textendash}Douglis{\textendash}Nirenberg} elliptic boundary problems with a parameter},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {51--55},
     year = {1992},
     volume = {26},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1992_26_2_a6/}
}