Geodesic
Variation formulae for the solutions of delay differential equations with discontinuous initial conditions
Sbornik. Mathematics, Tome 196 (2005) no. 8, pp. 1137-1163 Cet article a éte moissonné depuis la source Math-Net.Ru

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Variation formulae are proved for solutions of non-linear differential equations with variable delays and discontinuous initial conditions. The discontinuity of the initial condition means that at the initial moment of time the values of the initial function and the trajectory, generally speaking, do not coincide. The formulae obtained contain a new summand connected with the discontinuity of the initial condition and the variation of the initial moment. 
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G. L. Kharatishvili; T. A. Tadumadze. Variation formulae for the solutions of delay differential equations with discontinuous initial conditions. Sbornik. Mathematics, Tome 196 (2005) no. 8, pp. 1137-1163. http://geodesic.mathdoc.fr/item/SM_2005_196_8_a2/

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