@Article{fraser13:cl,
author  = {Nadir Durrani and Helmut Schmid and Alexander Fraser and Philipp Koehn and Hinrich Sch\"utze},
title   = {The {O}peration {S}equence {M}odel -- {C}ombining {N}-{G}ram-based and {P}hrase-based {S}tatistical {M}achine {T}ranslation},
journal = {Computational Linguistics},
volume  = {41},
number  = {2},
pages   = {157--186},
year    = {2015},
}