Ludovici, Donald W.; Kukla, Michael J.; Grous, Philip G.; Krishnan, Suma; Andries, Koen; De Bethune, Marie-Pierre; Azijn, Hilde; Pauwels, Rudi; De Clercq, Erik; Arnold, Edward; Janssen, Paul A.J. Bioorganic and Medicinal Chemistry Letters, 2001 , vol. 11, # 17 p. 2225 - 2228