Quote from the book "Эпоха Возрождения. От Никколо Макиавелли, Эразма Роттердамского, Джордано Бруно до Леонардо да Винчи"

Suitable for smartphones, Android tablets, e-readers (except Kindle) and many programs

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Works on any computer

Optimized and suitable for smartphones

Suitable for Android apps

Suitable for iOS devices (iPhone, iPad, iMac) and most reading apps

Perfect for iPhone and iPad

Development of FB2 format