VACCINE, vol. 17, no. 5, page. 490 - 496, 1999-02-05
VACCINE, vol. 17, no. 5, page. 473 - 479, 1999-02-05
JOURNAL OF VIROLOGY, vol. 72, no. 10, page. 8430 - 8436, 1998-10
VACCINE, vol. 15, no. 17-18, page. 1827 - 1833, 1997-12