New oscillation criteria for third order noncanonical differential equations of the form[left(r_2(t)left(r_1(t)y'(t)ight)'ight)'+p(t)y(au(t))=0]are established.Our technique employs an equivalent canonical representation of the studied equation, which essentially simplifies the examination of noncanonical equations. The results obtained are supported by several illustrative examples.
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