Singularly Perturbed Operators of Type -Δ + λδ

Author(s):  
Vladimir Koshmanenko
Keyword(s):  
Vestnik MEI ◽  
2019 ◽  
Vol 6 ◽  
pp. 131-137
Author(s):  
Abdukhafiz A. Bobodzhanova ◽  
◽  
Valeriy F. Safonov ◽  

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