1. Lectures on Elliptic Boundary Value Problems;Agmon,1965
2. Ein Existenz-und Eindeutigkeitssatz für die Hammerstein'sche Gleichung in Banachräumen;Amann;Math. Z.,1969
3. Linear spaces and approximation theory;Buck,1959
4. Linear Operators. Part I: General Theory;Dunford,1958
5. On the optimal net and the best cross section of a set in a normed space (Russian);Garkavi;Izv. Akad. Nauk SSSR,1962