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  collection in polycyclic groups[117X, [18XJournal of Algebra[118X (2007).
  
  [[20XGeb02[120X]  [16XGebhardt,  V.[116X,  [17XEfficient collection in infinite polycyclic groups[117X,
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  [[20XLGS90[120X]  [16XLeedham-Green,  C.  R. and Soicher, L. H.[116X, [17XCollection from the left
  and other strategies[117X, [18XJournal of Symbolic Computation[118X, [19X9[119X (1990), 665 -- 675.
  
  [[20XMal51[120X]  [16XMal'cev, A. J.[116X, [17XOn certain classes of infinite soluble groups[117X, [18XMat.
  Sb.[118X, [19X28[119X (1951), 567 -- 588.
  
  [[20XSeg83[120X]  [16XSegal, D.[116X, [17XPolycyclic Groups[117X, Cambridge University Press, Cambridge
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  [[20XVL90[120X]  [16XVaughan-Lee,  M.[116X,  [17XCollection  from  the  left[117X,  [18XJournal of Symbolic
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  [32X
