Geodesic
A Singular Perturbation Problem and A Neutral Differential-Difference Equation
Canadian mathematical bulletin, Tome 17 (1974) no. 1, pp. 77-83

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Vasil’eva, [2], demonstrates a close connection between the explicit formulae for solutions to the linear difference equation with constant coefficients (1.1) where z is an n-vector, A an n×n constant matrix, τ>0, and a corresponding differential equation with constant coefficients (1.2) (1.2) is obtained from (1.1) by replacing the difference z(t—τ) by the first two terms of its Taylor Series expansion, combined with a suitable rearrangement of the terms. 
Moore, Edward. A Singular Perturbation Problem and A Neutral Differential-Difference Equation. Canadian mathematical bulletin, Tome 17 (1974) no. 1, pp. 77-83. doi: 10.4153/CMB-1974-013-1
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