Granas, Andrzej; Dugundji, James (2003), Fixed Point Theory, Springer Monographs in Mathematics, New York: Springer-Verlag, p. 2, doi:10.1007/978-0-387-21593-8, ISBN 0-387-00173-5, MR 1987179 0-387-00173-5
Granas, Andrzej; Dugundji, James (2003), Fixed Point Theory, Springer Monographs in Mathematics, New York: Springer-Verlag, p. 2, doi:10.1007/978-0-387-21593-8, ISBN 0-387-00173-5, MR 1987179 0-387-00173-5
Granas, Andrzej; Dugundji, James (2003), Fixed Point Theory, Springer Monographs in Mathematics, New York: Springer-Verlag, p. 2, doi:10.1007/978-0-387-21593-8, ISBN 0-387-00173-5, MR 1987179 0-387-00173-5