Bibtex parser in Haskell

I am using parser bibtex for Haskell (https://hackage.haskell.org/package/bibtex). The parser works great. But I cannot parse special characters (like "P{\u{a}}lt{\u{a}}nea"). I need the characters to be encoded UTF-8. I tried using texSequence (https://hackage.haskell.org/package/bibtex-0.1.0.6/docs/src/Text-BibTeX-Parse.html#texSequence) but with no success. How can I parse special characters to UTF-8? Thank you!