Live-attenuated intranasal parainfluenza virus type 2 vaccine candidates developed by reverse genetics containing L polymerase protein mutations imported from heterologous paramyxoviruses - Nolan,S.M.; Surman,S.R.; Amaro-Carambot,E.; Collins,P.L.; Murphy,B.R.; Skiadopoulos,M.H. (Vaccine, 2005)