T. M. Flett, On an extension of absolute summability and some theorems of Little Wood and Paley, Proc. London Math. Soc. 3(7) 113-141, (1957).
H. Bor, On summability methods, Demonstration Math. xxv 187-92, (1992)
Bor, H., On two summability methods, Math. Proc. Cambridge Philos. Soc. 97(1) 147-149 (1985).
Seyhan, H. and Sonmez, A., On T-[N,pn,ψ]k summabilty factors, Portugalia Mathematica Vol. 54 (4) 393-398,(1997).
W.T. Sulaiman, Inclusion theorems for absolute matrix summability methods of an infinite series, IV, Indian J. pure Appl. Math. 34(11), 1547-1557 (2003).