Geodesic
The monotonicity of the first eigenvalue of non-self-adjoint problem and as the domain expands
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 22 (1967) no. 3 
A. G. Aslanyan. The monotonicity of the first eigenvalue of non-self-adjoint problem and as the domain expands. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 22 (1967) no. 3. http://geodesic.mathdoc.fr/item/RM_1967_22_3_a6/
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     author = {A. G. Aslanyan},
     title = {The monotonicity of the first eigenvalue of non-self-adjoint problem and as the domain expands},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     year = {1967},
     volume = {22},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1967_22_3_a6/}
}
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[1] M. A. Krasnoselskii, P. E. Sobolevskii, “O neotritsatelnosti sobstvennoi funktsii pervoi kraevoi zadachi dlya ellipticheskogo uravneniya”, UMN, 16:1 (1961), 197–199