  
  
  [1XReferences[101X
  
  [[20XBar09[120X]  [16XBarakat, M.[116X, [17XSpectral filtrations via generalized morphisms[117X (2009),
  ((\href{http://arxiv.org/abs/0904.0240}{\texttt{arXiv:0904.0240}})).
  
  [[20XBLH20[120X]  [16XBarakat,  M. and Lange-Hegermann, M.[116X, [17XThe mathtthomalg package -- A
  homological   algebra   mathsfGAP4   meta-package   for  computable  Abelian
  categories[117X                                                     (2007--2020),
  ((\url{https://homalg-project.github.io/pkg/homalg})).
  
  [[20XBR06[120X]          [16XBarakat,         M.         and         Robertz,         D.[116X,
  [17X\hrefhttps://algebra.mathematik.uni-siegen.de/barakat/eaca/homalg_eaca06.pdfmathtthomalg:
  First  steps  to an abstract package for homological algebra[117X, in Proceedings
  of   the   X  meeting  on  computational  algebra  and  its  applications  -
  \hrefhttp://alojamientos.us.es/eaca2006/eaca2006_eng.htmlEACA 2006, Sevilla,
  Spain (2006), 29--32.
  
  
  
  [32X
