On the asymptotic behavior of the spectral function and expansion in eigenfunctions of the equation Δ𝑒+{πœ†-π‘ž(π‘₯₁,π‘₯β‚‚,π‘₯₃)}𝑒=0

Author(s):  
B. M. Levitan
Mathematical Notes β—½  
10.1007/bf02355090 β—½  
1997 β—½  
Vol 61 (5) β—½  
pp. 664-668
Author(s):  
A. S. Pechentsov β—½  
A. Yu. Popov

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