Concerning priority

An important, but factual point (at least in my opinion) that is not clearly discussed in the article about the discovery of the "Englert-Brout-Higgs-Guralnik-Hagen-Kibble mechanism" is which group published first the mechanism? In the article of Higgs (received the 31 August 1964) we could find a reference to the work of Brout and Englert (received the 6 June 1964); in the article of Guralnik-Hagen-Kibble (received the 12 October 1964) we found references to the works of Brout and Englert and of Higgs. So causality provides an element of answer to this question that has to be taken into account.