In this paper,
the distance between adjacent zeros of oscillatory solutions for second order nonlinear neutral delay differential equations
class="formula" id="fd000005">
where
class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0893965916302051&_mathId=si2.gif&_user=111111111&_pii=S0893965916302051&_rdoc=1&_issn=08939659&md5=559d9a05c1f92005d5a28801b3dd08c3" title="Click to view the MathML source">z(t)=x(t)+p(t)x(t−τ)class="mathContainer hidden">class="mathCode"> is investigated. By means of inequality techniques, specific function sequences and nonincreasing solutions for
corresponding first order differential inequality, some new estimates for
the distribution of zeros of oscillatory solutions have been presented, which have extended and improved some known results.