I can recommend Teschls book on ODEs, and it's completely free: https://www.mat.univie.ac.at/~gerald/ftp/book-ode/index.html https://www.mat.univie.ac.at/~geral

I can recommend Teschls book on ODEs, and it's completely free: https://www.mat.univie.ac.at/~gerald/ftp/book-ode/index.html https://www.mat.univie.ac.at/~gerald/ftp/book-ode/index.html And if you like something very applied: Modern Statistics for Modern Biology https://www.huber.embl.de/msmb/ https://www.huber.embl.de/msmb/