Hi, When I use @incollection{millerIIIa2, title = "Decision problems for groups: survey and reflections", author = "Charles F. {{Miller III}}", year = "1992" } no problem, but when I change to @incollection{millerIIIa2, title = "Decision problems for groups: survey and reflections", author = "Charles F. {{Miller III}}", booktitle = "Algorithms and Classification in Combinatorial Group Theory", year = "1992" } then I receive: ! Extra \endcsname. <argument> ...er {}\csname @@pb@pubyear\endcsname )\insertEdition {, }{ ed. }{} \firstoftwoarguments #1#2->#1 <argument> ...{}}{)\insertEdition {, }{ ed. }{}}{} \insertpages {\unskip , p.... \firstoftwoarguments #1#2->#1 \@@pvdataincollection ...p , p.~}{. }{\unskip . }} \insertNote { }{.}{}\unskip \dotypesetapublication ...ve {\getvalue {pbdt-#1}} \fi \egroup ... l.462 \completepublications[criterium=cite] %all per tots I suspect that /usr/share/texmf/tex/context/bib/bibl-ams.tex has an error. Taco can you confirm it. I have MKII. Xan.