PeleshenkoB. I. 2005. “Interpolation of Operators of Weak Type $(ϕ_0, ψ_0, ϕ_1, ψ_1)$ in Lorentz Spaces”. Ukrains’kyi Matematychnyi Zhurnal 57 (11), 1490–1507. https://umj.imath.kiev.ua/index.php/umj/article/view/3703.