Weighted estimates for the integral operators with monotone kernel on a half-axis. Stepanov, V.D., Ushakova, E.P. (2004) Sibirskij Matematicheskij Zhurnal
Weighted estimates for the Riemann-Liouville operators with variable limits. Prokhorov, D. V. (2003) Sibirskij Matematicheskij Zhurnal