• Экспоненциальный сдвиг

http://ftp.fred.net/jacobs/DE/expshift.pdf

• Приведение матрицы к жордановой форме

https://www.math.utah.edu/~yplee/teaching/2270f14/Jordan_Form.pdf

https://brilliant.org/wiki/jordan-canonical-form/

• Вронскиан

http://scipp.ucsc.edu/~haber/ph116C/Wronskian_12.pdf

• Пара вкусных книжек

https://www.math.hkust.edu.hk/~machas/differential-equations.pdf

https://www.math.toronto.edu/selick/B44.pdf

https://math24.net/first-integrals-page-2.html http://www.sci.brooklyn.cuny.edu/~mate/misc/first_integrals_partdiff_eq.pdf

https://users.math.msu.edu/users/gnagy/teaching/ode.pdf

• Lyapunov functions

https://www.ndsu.edu/pubweb/~novozhil/Teaching/480%20Data/13.pdf http://www.users.abo.fi/gsoderba/PhaseP/ljap13.pdf https://thelib.info/matematika/396935-funkciya-lyapunova-vtoraya-metoda-lyapunova/

• Stability and linearization

https://scholar.rose-hulman.edu/cgi/viewcontent.cgi?article=1033&context=rhumj