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"djvu" is an intermediate, device-independent format produced by several applications, one of them being the LaTeX typesetter/compiler. There are a lot of programs available for converting djvu into pdf, but you'll (probably) need a computer for it.
Converting djvu or PDF into EPUB isn't worth it, as JSWolf says. PDF is (mostly) a fixed layout format for viewing on large screens and printing, and trying to turn it into a reflowable format is not going to end well.
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