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A further discussion on Galambos problem. Shen, Lu-ming; Liu, Yue-hua; Zhou, Yu-yuan — 2007 Acta Mathematica Academiae Paedagogicae Nyí regyháziensis. New Series [electronic only]
Doubling properties for second order parabolic equations. Safonov, Mikhail V.; Yuan, Yu — 1999 Annals of Mathematics. Second Series
Oscillation of solutions for nonlinear second order neutral equations with deviating arguments Wang Peiguang; Yuan Hong Yu — 2001 Mathematica Slovaca