Haku
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Resistance of plants to the pea aphid Acyrthosiphon pisum Harris (Hom., Aphididae) : I. Fecundity of the biotypes on different host plants
(Agricultural Research CentreMaatalouden tutkimuskeskus, 1970)
Resistance of plants to the pea aphid, Acyrthosiphon pisum Harris (Hom., Aphididae) : 4. fecundity on different alsike and white clover varieties
(Agricultural Research CentreMaatalouden tutkimuskeskus, 1971)