@string{nice_journal = {Nice Journal}}

@string{jean = {Jean}}

@string{cesar = {César}}

@article{Cesar2013,
 author = jean # { } # cesar,
 comments = {A comment},
 journal = nice_journal,
 keyword = {keyword1, keyword2},
 month = jan,
 pages = {12-23},
 title = {An amazing title},
 volume = {12},
 year = {2013}
}