Librería Samer Atenea
Librería Aciertas (Toledo)
Kálamo Books
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Librería Elías (Asturias)
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Librería Kolima (Madrid)
Librería Proteo (Málaga)
An extended introduction to ordinary differential equations. This book can be used as self study material. It contains a little bit of theory and lot of solved examples as well as tons of exercises to test your ability to solve problems using the techniques presented in the text.