Koszul duality in deformation quantization, I
Koszul Property and Poincare' Series of Matrix-Bialgebras of Type $A_N$
Koszul Theorem for S-Lie coalgebras
Koszulity for nonquadratic algebras II
Krein duality, positive 2-algebras, and dilation of comultiplications (To the centenary of Mark G.Krein)
KZ characteristic variety as the zero set of classical Calogero-Moser Hamiltonians
KZ equation on the moduli space ${\mathcal M}_{0,5}$ and the harmonic product of multiple polylogarithms