Maczynski Maciej; Scheffold Egon: On elementary operators of length 1 and some order intervals in BS(H). In: Acta scientiarum mathematicarum, (70) 1-2. pp. 405-417. (2004)
Scheffold Egon: Der Bidual von F-Banachverbandsalgebren. In: Acta scientiarum mathematicarum, (55) 1-2. pp. 167-179. (1991)