Normalidad en realizaciones generalizadas (RY (X)). Carlos Ruiz Salguero, Joaquín Luna Torres (1982) Collectanea Mathematica
Normalisation for the fundamental crossed complex of a simplicial set. Brown, R., Sivera, R. (2007) Journal of Homotopy and Related Structures
Normalizing the cyclic modules of Connes. W.G. Dwyer, D.M. Kan (1985) Commentarii mathematici Helvetici
Note on homotopy pullbacks in abelian categories Thomas Müller (1983) Cahiers de Topologie et Géométrie Différentielle Catégoriques