Some modifications of Sobolev spaces and non-linear boundary value problems Kufner, A. — 1979 Equadiff IV
Weighted inequalities and spectral problems. Kufner, A. — 2010 Banach Journal of Mathematical Analysis [electronic only]
Weighted modular inequalities for monotone functions. Drábek, P.; Heinig, H.P.; Kufner, A. — 1997 Journal of Inequalities and Applications [electronic only]
The Hardy inequality with one negative parameter. Kufner, A.; Kuliev, K.; Kulieva, G. — 2008 Banach Journal of Mathematical Analysis [electronic only]