  
  
  [1XReferences[101X
  
  [[20XCS06[120X]  [16XCatino,  F. and Spinelli, E.[116X, [17XLie nilpotent group algebras and upper Lie codimension subgroups[117X, [18XComm. Algebra[118X,
  [19X34[119X, 10 (2006), 3859--3873.
  
  [[20XDu92[120X] [16XDu, X. K.[116X, [17XThe centers of a radical ring[117X, [18XCanad. Math. Bull.[118X, [19X35[119X, 2 (1992), 174-179.
  
  [[20XHB82[120X]   [16XHuppert,   B.  and  Blackburn,  N.[116X,  [17XFinite  groups.  II[117X,  Springer-Verlag,  Grundlehren  der  Mathematischen
  Wissenschaften [Fundamental Principles of Mathematical Sciences], [19X242[119X, Berlin (1982), xiii+531 pages, ((, AMD, 44)).
  
  [[20XJPS96[120X]  [16XJespers,  E.,  Parmenter, M. M. and Sehgal, S. K.[116X, [17XCentral units of integral group rings of nilpotent groups[117X,
  [18XProc. Amer. Math. Soc.[118X, [19X124[119X, 4 (1996), 1007--1012.
  
  [[20XLR86[120X]  [16XLevin,  F. and Rosenberger, G.[116X, [17XLie metabelian group rings[117X, in Group and semigroup rings (Johannesburg, 1985),
  North-Holland, North-Holland Math. Stud., [19X126[119X, Amsterdam (1986), 153--161.
  
  [[20XPPS73[120X]  [16XPassi,  I.  B.  S.,  Passman,  D. S. and Sehgal, S. K.[116X, [17XLie solvable group rings[117X, [18XCanad. J. Math.[118X, [19X25[119X (1973),
  748--757.
  
  [[20XRos97[120X]  [16XRossmanith, R.[116X, [17XCentre-by-metabelian group algebras[117X, Ph.D. thesis, Friedrich-Schiller-Universit{\accent127a}t
  Jena (1997).
  
  [[20XRos00[120X]  [16XRossmanith,  R.[116X,  [17XLie centre-by-metabelian group algebras in even characteristic. I, II[117X, [18XIsrael J. Math.[118X, [19X115[119X
  (2000), 51--75, 77--99.
  
  [[20XRos02[120X]  [16XRossmanith,  R.[116X,  [17XLie  centre-by-metabelian group algebras over commutative rings[117X, [18XJ. Algebra[118X, [19X251[119X, 2 (2002),
  503--508.
  
  [[20XSha91[120X]  [16XShalev,  A.[116X,  [17XLie  dimension  subgroups,  Lie nilpotency indices, and the exponent of the group of normalized
  units[117X, [18XJ. London Math. Soc. (2)[118X, [19X43[119X, 1 (1991), 23--36.
  
  [[20XSim94[120X]  [16XSims,  C.  C.[116X,  [17XComputation  with  finitely  presented  groups[117X,  Cambridge  University Press, Encyclopedia of
  Mathematics and its Applications, [19X48[119X, Cambridge (1994), xiii+604 pages.
  
  [[20XWur93[120X] [16XWursthorn, M.[116X, [17XIsomorphisms of modular group algebras: an algorithm and its application to groups of order 2sp
  6[117X, [18XJ. Symbolic Comput.[118X, [19X15[119X, 2 (1993), 211--227.
  
  
  
  [32X
