1965 ◽  
Vol 3 (2) ◽  
pp. 141-171 ◽  
Author(s):  
Leonard Weiss ◽  
R.E. Kalman

1990 ◽  
Vol 21 (4) ◽  
pp. 739-747 ◽  
Author(s):  
ANTONIO LEPSCHY ◽  
GIAN ANTONIO MIAN ◽  
UMBERTO VIARO

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