Lázár, J.; Mikulás, J.; Farkas, G.; Kölber, M. Certification Programme for Production of Virus-Free Propagating Material of Grapevine and Its Results in Hungary. Int. j. hortic. sci. 2002, 8 (3-4), 39-43. https://doi.org/10.31421/IJHS/8/3-4/360.