"vital reference" — Collocation dictionary inglés

vital reference collocation
Automatic translation (We do not guarantee its correctness): istotne odniesienie
  1. vital adjetivo + reference sustantivo
    Very loose collocation

    And, yes, the English experience is a vital reference for the South American authorities in their own attempts to deal with football violence - lots of legislative examples have beenn looked at, and a recent operation in Brazil went by the name of Operation Hooligans.