Geodesic
The Treves estimate and absence of positive eigenvalues for Shrodinger operator with complex potentials
Zapiski Nauchnykh Seminarov POMI, Boundary-value problems of mathematical physics and related problems of function theory. Part 17, Tome 147 (1985), pp. 13-17 
A. F. Vakulenko. The Treves estimate and absence of positive eigenvalues for Shrodinger operator with complex potentials. Zapiski Nauchnykh Seminarov POMI, Boundary-value problems of mathematical physics and related problems of function theory. Part 17, Tome 147 (1985), pp. 13-17. http://geodesic.mathdoc.fr/item/ZNSL_1985_147_a2/
@article{ZNSL_1985_147_a2,
     author = {A. F. Vakulenko},
     title = {The {Treves} estimate and absence of positive eigenvalues for {Shrodinger} operator with complex potentials},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {13--17},
     year = {1985},
     volume = {147},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1985_147_a2/}
}
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The absence of embedded eigenvalues for Shrodinger and Stark operators is proved using inequalities of the Hardy type.