Population structure, genetic variation and linkage disequilibrium in perennial ryegrass populations divergently selected for freezing tolerance oleh Mallikarjuna Rao eKovi, Siri eFjellheim, Simen R Sandve, Simen R Sandve, Arild eLarsen, Heidi eRudi, Torben eAsp, Matthew Peter Kent, Odd Arne eRognli