Posnette, A. F., A. A. J. Swait. "The incidence of virus diseases in English sweet-cherry orchards and their effect on yield." Annals of Applied Biology 61/3 (June 1968): 351–360.

Posnette, A. F., A. A. J. Swait. "The incidence of virus diseases in English sweet-cherry orchards and their effect on yield." Annals of Applied Biology 61/3 (June 1968): 351–360.