1. Titchmarsh, E.G.: ‘On conjugate functions’, Proc. London Math. Soc.29 (1928), 49–80.
2. Vinogradova, I.A.: ‘Generalized integrals and Fourier series’, Itogi Nauk. Mat. Anal. 1970 (1971), 65–107 (in Russian).
3. Aleksandrov, P.S.: C.R Acad. Sci. Paris162 (1916), 323–325.
4. Aleksandrov, P.S.: Theory of functions of a real variable and the theory of topological spaces, Moscow, 1978 (in Russian).
5. Kolmogorov, A.N.: ‘P.S. Aleksandrov and the theory of cooperations’, Uspekhi Mat. Nauk21, no. 4 (1966), 275–278 (in Russian).