 Usage:  genbil(phi,theta,gamma,noise)  
 
 Input:

  phi                    vector (length p=AR order): AR coefficients 
                         
  theta                  vector (length q=MA order): MA coefficients 
                         
  gamma                  vector (length p*q): Bilinear coefficient 
                         input order: (1,1),(1,2), ... (1,q), (2,1) ... (p, q) 
                         
  noise                  vector (length n=sample size needed): noise vector 
                         
 Output:

  x                      generated Bilinear process 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
