This paper reuses an idea first devised by Kwong to obtain upper bounds for the distance between a zero and an adjacent critical point of a solution of the second order half-linear differential equation , with , , and real such that . It also compares it with other methods developed by the authors.
"The Distribution of Zeroes and Critical Points of Solutions of a Second Order Half-Linear Differential Equation." Abstr. Appl. Anal. 2013 1 - 6, 2013. https://doi.org/10.1155/2013/147192