\input zb-basic \input zb-ioport \iteman{io-port 50313651} \itemau{Cockburn, Bernardo; Gopalakrishnan, Jayadeep; Sayas, Francisco-Javier} \itemti{A projection-based error analysis of HDG methods} \itemso{Math. Comput. 79, No. 271, 1351-1367 (2010).} \itemcc{} \itemut{} \itemli{doi:10.1090/S0025-5718-10-02334-3} \end