1. E. G. Bakhtigareeva and M. L. Goldman, ‘‘Construction of an optimal envelope for a cone of nonnegative functions with monotonicity properties,’’ Proc. Steklov Inst. Math. 293, 37–55 (2016).
2. J. Berg and J. Löfström, Interpolation Spaces. An Introduction (Springer, Berlin, Heidelberg, New York, 1976).
3. C. Bennett and R. Sharpley, Interpolation of Operators, Vol. 129 of Pure Appl. Math. (Academic, Boston, 1988).
4. V. I. Burenkov and M. L. Goldman, ‘‘Calculation of the norm of a positive operator on the cone of monotone functions,’’ Proc. Steklov Inst. Math. 210, 47–65 (1995).
5. M. Carro, L. Pick, J. Soria, and D. V. Stepanov, ‘‘On embeddings between classical Lorentz spaces,’’ Math. Inequal. Appl. 4, 397–428 (2001).