Bounds for the solutions of Δω≧P(r)f(w)
Compositio Mathematica, Tome 18 (1967) no. 1-2, pp. 162-169. 
@article{CM_1967__18_1-2_162_0,
     author = {Goyal, Vinod B.},
     title = {Bounds for the solutions of $\Delta \omega \geqq P(r)f(w)$},
     journal = {Compositio Mathematica},
     pages = {162--169},
     publisher = {P. Noordhoff N. V., Groningen},
     volume = {18},
     number = {1-2},
     year = {1967},
     zbl = {0146.34502},
     language = {en},
     url = {http://www.numdam.org/item/CM_1967__18_1-2_162_0/}
}
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Goyal, Vinod B. Bounds for the solutions of $\Delta \omega \geqq P(r)f(w)$. Compositio Mathematica, Tome 18 (1967) no. 1-2, pp. 162-169. http://www.numdam.org/item/CM_1967__18_1-2_162_0/

V.B. Goyal, [1] Bounds for the solutions of a certain class of non-linear Partial Differential Equation, Ph. D. dissertation (1963), Carnegie Inst. of Tech., Pittsburgh, U.S.A. (To be published.)

Z. Nehari, [2] Bounds for the solutions of a class of non-linear differential Equations, Proc. of Amer. Math. Soc. (1963) pp. 829-836. | MR | Zbl

R. Osserman, [3] On the inequality Δu ≧ f(u), Pacific Journal of Math. 7 (1957) pp. 1641-1647. | Zbl