TY  - JOUR
A1  - Brasche, Johannes F.
A1  - Neidhardt, Hagen
T1  - Some remarks to Krein's extension theory
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Brasche, Johannes F.
A1  - Koshmanenko, V. D.
A1  - Neidhardt, Hagen
T1  - Some new aspects of Krein's extension theory
Y1  - 1994
ER  -