edited by G. Berg, M. Essén, and Å. Pleijel

Universitas Upsaliensis , distributor, Almqvist & Wiksell International 1977 Acta Universitatis Upsaliensis Symposia Universitatis Upsaliensis annum quingentesimum celebrantis ; 7

Available at 15 libraries

Matts R. Essén ; with a paper by Christer Borell

Springer-Verlag 1975 Lecture notes in mathematics 467

: Germany , : U.S.

Available at 72 libraries