Geodesic
Strong coupling expansion for the ground-state functional in a~model of the quantum theory of a~scalar neutral field with self-interaction $g\varphi^4$ in the case of two-dimensional spacetime
Teoretičeskaâ i matematičeskaâ fizika, Tome 26 (1976) no. 2, pp. 277-281

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It is argued that the solution of the ground-state equation (1) in the case of the strong coupling (5) can be represented by series in integral powers of the parameter $\varepsilon$, and that these series have a positive radius of convergence. 
@article{TMF_1976_26_2_a12,
     author = {L. G. Zastavenko},
     title = {Strong coupling expansion for the ground-state functional in a~model of the quantum theory of a~scalar neutral field with self-interaction $g\varphi^4$ in the case of two-dimensional spacetime},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {277--281},
     publisher = {mathdoc},
     volume = {26},
     number = {2},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1976_26_2_a12/}
}
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L. G. Zastavenko. Strong coupling expansion for the ground-state functional in a~model of the quantum theory of a~scalar neutral field with self-interaction $g\varphi^4$ in the case of two-dimensional spacetime. Teoretičeskaâ i matematičeskaâ fizika, Tome 26 (1976) no. 2, pp. 277-281. http://geodesic.mathdoc.fr/item/TMF_1976_26_2_a12/