Geodesic
Energy of a system of many bosons coupled by gravitational forces
Teoretičeskaâ i matematičeskaâ fizika, Tome 15 (1973) no. 3, pp. 307-310

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An expression is obtained for the ground-state energy of a system of $N$ bosons interacting through gravitational forces. In the limit $N\to\infty$ the diagonal part is the principal part in the operator $\psi(x)$, and it determines the principal term of the expansion of $E_N$ in the limit $N\to\infty$. 
@article{TMF_1973_15_3_a1,
     author = {L. G. Zastavenko},
     title = {Energy of a system of many bosons coupled by gravitational forces},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {307--310},
     publisher = {mathdoc},
     volume = {15},
     number = {3},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1973_15_3_a1/}
}
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L. G. Zastavenko. Energy of a system of many bosons coupled by gravitational forces. Teoretičeskaâ i matematičeskaâ fizika, Tome 15 (1973) no. 3, pp. 307-310. http://geodesic.mathdoc.fr/item/TMF_1973_15_3_a1/