 Usage:  b = gls (x, y{, om})  
 
 Input:

  x                      n x p x d1 x ... x dn array 
                         
  y                      n x 1 x d1 x ... x dn array 
                         
  om                     optional, n x n x d1 x ... x dn array 
                         
 Output:

  b                      p x 1 x d1 x ... x dn array 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
