W. Ritter

The control of parasitic bee mites: Varroa jacobsoni, Acarapis woodi and Tropilaelaps clareae with formic acid.

(1989)

American Bee Journal .

H. Hoppe

,W. Ritter

,E. W. C. Stephen

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Seasonal changes in mite (Tropilaelaps clareae) and honeybee (Apis mellifera) populations in apistan treated and untreated colonies

(2005)

Apimondia Journal .

E. S. W. Camphor

,A. A. Hashmi

,W. Ritter

,I. D. Bowen

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