1. Bourbaki N.,Integration, chap. VII–VIII, 1963, Hermann, Paris.
2. Cooke R.G.,Infinite matrices and sequence spaces, Macmillan, London, 1950.
3. Csiszár I.,On infinite products of random elements and infinite convolutions of probability distributions on locally compact groups, Z. Wahrscheinlichkeitstheorie Verw. Gebiete5 (1966), 279–295.
4. Grenander U.,Probabilities on algebraic structures, J. Wiley, N.Y., 1963.
5. Jardas C., Sarapa N.,On the summability of pairs of sequences, Glasnik Mat.26 (46) (1991), 67–78.