[1]
MURTHY, K.N. and RAO, C.V. 1998. THEORY OF DIFFERENTIAL INEQUALITIES ASSOCIATED WITH $n$th ORDER NONLINEAR DIFFERENTIAL EQUATIONS AND THEIR APPLICATIONS TO THREE POINT BOUNDARY VALUE PROBLEMS. Tamkang Journal of Mathematics. 29, 2 (Jun. 1998), 137–144. DOI:https://doi.org/10.5556/j.tkjm.29.1998.4285.