  
  
  [1XReferences[101X
  
  [[20XBar[120X] [16XBarakat, M.[116X, [17XSpectral Filtrations via Generalized Morphisms[117X, [18X[118X, [19X[119X, (), ,
  ((arxiv.org/abs/0904.0240)).
  
  [[20XBR08[120X] [16XBarakat, M. and Robertz, D.[116X, [17Xhomalg -- A Meta-Package for Homological
  Algebra[117X, [18XJ. Algebra Appl.[118X, [19X7[119X, 3 (2008), 299--317, ((arXiv:math.AC/0701146)).
  
  [[20XCE99[120X]   [16XCartan,  H.  and  Eilenberg,  S.[116X,  [17XHomological  algebra[117X,  Princeton
  University  Press, Princeton Landmarks in Mathematics, Princeton, NJ (1999),
  xvi+390 pages, ((With an appendix by David A. Buchsbaum, Reprint of the 1956
  original)).
  
  [[20XGM03[120X]  [16XGelfand,  S.  I.  and  Manin, Y. I.[116X, [17XMethods of homological algebra[117X,
  Springer-Verlag,  2.  edition,  Springer  Monographs  in Mathematics, Berlin
  (2003), xx+372 pages.
  
  [[20XHS97[120X]  [16XHilton,  P.  J.  and Stammbach, U.[116X, [17XA course in homological algebra[117X,
  Springer-Verlag,  Second edition, Graduate Texts in Mathematics, [19X4[119X, New York
  (1997), xii+364 pages.
  
  [[20XML63[120X]  [16XMac  Lane,  S.[116X,  [17XHomology[117X,  Academic Press Inc., Die Grundlehren der
  mathematischen  Wissenschaften,  Bd. 114, Publishers, New York (1963), x+422
  pages.
  
  [[20XRot79[120X]  [16XRotman,  J.  J.[116X,  [17XAn  introduction to homological algebra[117X, Academic
  Press   Inc.  [Harcourt  Brace  Jovanovich  Publishers],  Pure  and  Applied
  Mathematics, [19X85[119X, New York (1979), xi+376 pages.
  
  [[20XWei94[120X]  [16XWeibel,  C.  A.[116X,  [17XAn introduction to homological algebra[117X, Cambridge
  University  Press,  Cambridge Studies in Advanced Mathematics, [19X38[119X, Cambridge
  (1994), xiv+450 pages.
  
  
  
  [32X
