Fixing the citations of Williams' and Bohbot's projects

ICHLL_Brenon.md

@@ -88,7 +88,7 @@ since the inception of the project [@tei_vault] and @ide_encoding_1995
 underlines the amount of work which went into the third version of the
 guidelines (P3) to provide a toolbox both general and expressive enough to
 account for the variety of conventions found in dictionaries. This module has
-been successfully used to encode both historical [@williams2017], [@bohbot2018]
+been successfully used to encode both historical [@williams2017; @bohbot2018]
 and digitally native dictionaries [@bowers_bridging_2018]. In addition, a
 specific guidelines tailored at encoding dictionaries named TEI-Lex0 has also
 been published [@banski_tei_lex0_2017].