Sell, George R.: The geometric theory of Volterra integral equations - a preliminary report.
(English).
In:
Ráb, Miloš
and Vosmanský, Jaromír (eds.): Proceedings of Equadiff III.
3rd Czechoslovak Conference on Differential Equations and Their Applications. Brno, Czechoslovakia, August 28 - September 1, 1972.
Univ. J. E. Purkyně - Přírodovědecká fakulta, Brno, 1973.
pp. 139-143
