Classical swine fever virus replicon particles lacking the E$^{\ m rns}$ gene: a potential marker vaccine for intradermal applicationCaroline F. Frey, Oliver Bauhofer, Nicolas Ruggli, Artur Summerfield, Martin A. Hofmann and Jon-Duri TratschinVet. Res., 37 5 (2006) 655-670DOI: https://doi.org/10.1051/vetres:2006028