Several scientific papers have disappeared from internet.
For example the clinical trials with Artemisia annua in RD Congo from 2000 (attachment 1)
(M.S. Mueller , I.B. Karhagomba , H.M. Hirt , E. Wemakor. The potential of Artemisia annua L. as a locally produced remedy for malaria in the tropics: agricultural, chemical and clinical aspects. Journal of Ethnopharmacology 73 (2000) 487–493)
and clinical trials 2002 (attachment 2)