1. On matrices depending on parameters;Arnold;Russian Math. Surveys,1971
2. Lectures on bifurcations in versal families;Arnold;Russian Math. Surveys,1972
3. Geometrical Methods in the Theory of Ordinary Differential Equations;Arnold,1988
4. Normal forms in a space of matrices;Belitskiĭ,1983
5. Number Theory: An Introduction to Mathematics;Coppel,2009