Geodesic
Study of a~model for the interaction of a~nonrelativistic particle with a~scalar quantized field by the method of functional integration
Trudy Matematicheskogo Instituta imeni V.A. Steklova, International Conference on Mathematical Problems of Quantum Field Theory and Quantum Statistics. Part II. Fields and Particles. Mathematical Questions of Quant, Tome 136 (1975), pp. 162-176.

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The polaron Green function is investigated by the continual integration methods in the scope of staight-line paths approximation. A comparison is made of the results of various functional approximations when the Green function vacuum average is calculated and the first corrections to the leading term are investigated. 
@article{TM_1975_136_a9,
     author = {S. P. Kuleshov and V. A. Matveev and A. N. Sisakyan and M. A. Smondyrev},
     title = {Study of a~model for the interaction of a~nonrelativistic particle with a~scalar quantized field by the method of functional integration},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {162--176},
     publisher = {mathdoc},
     volume = {136},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1975_136_a9/}
}
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S. P. Kuleshov; V. A. Matveev; A. N. Sisakyan; M. A. Smondyrev. Study of a~model for the interaction of a~nonrelativistic particle with a~scalar quantized field by the method of functional integration. Trudy Matematicheskogo Instituta imeni V.A. Steklova, International Conference on Mathematical Problems of Quantum Field Theory and Quantum Statistics. Part II. Fields and Particles. Mathematical Questions of Quant, Tome 136 (1975), pp. 162-176. http://geodesic.mathdoc.fr/item/TM_1975_136_a9/