New Stability Conditions for Linear Differential Equations with Several   Delays
  New explicit conditions of asymptotic and exponential stability are obtained for the scalar nonautonomous linear delay differential equation $$ \dot{x}(t)+\sum_{k=1}^m a_k(t)x(h_k(t))=0 $$ with measurable delays and coefficients. These results are compared to known stability tests. 
Leonid Berezansky and Elena Braverman