1. Astashkin, S.V.: On the multiplier of a symmetric space with respect to a tensor product. Funktsional. Anal. i Prilozhen. 30(4), 58-60 (1996) (in Russian)
2. translation in Funct. Anal. Appl. 30(4), 267-269 (1997)
3. Astashkin, S.V.: Tensor product in symmetric function spaces. Collect. Math. 48(4–6), 375–391 (1997)
4. Astashkin, S.V., Maligranda, L., Semenov, E.M.: Multiplicator space and complemented subspaces of rearrangement invariant space. J. Funct. Anal. 202, 247–276 (2003)
5. Bari, N.K.: A Treatise on Trigonometric Series, vol. I. Macmillan Co., New York (1964)