1. A. Benedek, R. Panzone, The Spaces LP, with Mixed Norm, Duke Math. J. 28 (1961), 301–324.
2. Yu. I. Gribanov, On the Measurability of a Function (in Russian), Izv. Vyssh. Uchebn. Zaved. Mat. 3 (1970), 22–26.
3. P. R. Halmos, Measure Theory, Berlin, Heidelberg, New York: Springer (1974).
4. L. V. Kantorovich, G. P. Akilov, Functional Analysis, Oxford: Pergamon Press, 2nd edition (1982).
5. W. A. J. Luxemburg, On the Measurability of a Function which Occurs in a Paper by A. C. Zaanen, Proc. Netherl. Acad. Sci. (A) 61 (1958), 259–265 (Indag. Math. 20, 259–265).