38.5 References for contrib_ode
-  E. Kamke, Differentialgleichungen Losungsmethoden und Losungen, Vol 1,
    Geest & Portig, Leipzig, 1961
-  G. M. Murphy, Ordinary Differential Equations and Their Solutions,
    Van Nostrand, New York, 1960
-  D. Zwillinger, Handbook of Differential Equations, 3rd edition,
    Academic Press, 1998
-  F. Schwarz, Symmetry Analysis of Abel’s Equation, Studies in
    Applied Mathematics, 100:269-294 (1998)
-  F. Schwarz, Algorithmic Solution of Abel’s Equation,
    Computing 61, 39-49 (1998)
-  E. S. Cheb-Terrab, A. D. Roche, Symmetries and First Order
    ODE Patterns, Computer Physics Communications 113 (1998), p 239.
 (http://lie.uwaterloo.ca/papers/ode_vii.pdf)
-  E. S. Cheb-Terrab, T. Kolokolnikov,  First Order ODEs,
    Symmetries and Linear Transformations, European Journal of
    Applied Mathematics, Vol. 14, No. 2, pp. 231-246 (2003).
 (http://arxiv.org/abs/math-ph/0007023, 
    http://lie.uwaterloo.ca/papers/ode_iv.pdf)
 
-  G. W. Bluman, S. C. Anco, Symmetry and Integration Methods for
    Differential Equations, Springer, (2002)
-  M. Bronstein, S. Lafaille,
Solutions of linear ordinary differential equations in terms
of special functions,
Proceedings of ISSAC 2002, Lille, ACM Press, 23-28.