Complex sentence: In his first papers Fesenko discovered several types of explicit formulas for the generalized Hilbert symbol on local fields and higher local fields in the case of even residue characteristic, which belong to the branch of Vostokov's explicit formulas.
Split into simpler sentences: In his first papers Fesenko discovered several types of explicit formulas for the generalized Hilbert symbol on local fields and higher local fields in the case of even residue characteristic. There formulas belong to the branch of Vostokov's explicit formulas.