1. Bierstedt, K.D., Meise, R.G., Summers, W.H.: Köthe sets and Köthe sequence spaces. In: Functional Analysis, Holomorphy and Approximation Theory (Rio de Janeiro, 1980), Volume 71 of North-Holland Math. Stud., pp. 27–91. North-Holland, Amsterdam–New York (1982)
2. Ciaś, T., Piszczek, K.: General approach to Köthe echelon algebras. Math. Nachr. 294(3), 486–517 (2021)
3. Dales, H.G.: Banach Algebras and Automatic Continuity, Volume 24 of London Mathematical Society Monographs. New Series. The Clarendon Press, Oxford University Press, New York (2000). (Oxford Science Publications)
4. Ghamarshoushtari, R., Zhang, Y.: Amenability properties of Banach algebra valued continuous functions. J. Math. Anal. Appl. 422(2), 1335–1341 (2015)
5. Helemskiĭ, A.Y.: The Homology of Banach and Topological Algebras, Volume 41 of Mathematics and its Applications (Soviet Series). Kluwer Academic Publishers Group, Dordrecht (1989). (Translated from the Russian by Alan West)