Jǐshí wèi kēxuéjiā liánshǔ le zhè fēng gōngkāixìn.
Several dozen scientists co-signed this open letter.
Tips
usage
联署 is the formal word for collective signing - petitions (请愿), open letters (公开信), joint statements (联合声明), legislative motions. The noun 联署人 means 'co-signatory'. For ordinary 'sign your name', use 签名 instead.