Controversy surrounded Real Madrid's first goal after Dutch referee Leo Horn ignored his linesman signalling that Enrique Mateos was offside before awarding a penalty for a foul on Mateos that appeared to have been committed outside the penalty area.
^Simpson, Paul; Hesse-Lichtenberger, Uli (October 2005). Sleight, Hugh, ed. "50 Things You Never Knew About... The European Cup". FourFourTwo (Teddington: Haymarket Consumer) (134): 101. ISSN1355-0276.