My book Aestechnique is now published in English. This is a collection of exercises that combine musical and mechanism challenges; therefore, you develop not only better fingers, but also better musical abilities that are required when playing a composition (such as making a crescendo or changing the colour through a musical phrase).
You can buy both the printed version and the Kindle one at Amazon stores worldwide, such as https://www.amazon.com/dp/B09C9X35Z9
If you are a subscriber of Kindle Unlimited, you may read it for free.