title: The differentiation of the eggs of Haemonchus contortus and Ostertagia species of the sheep and a note on the relative generic egg-laying rates.
authors.forename: J H
authors.initials: JH
authors.lastname: TETLEY
mesh_terms: D000818:Animals; D006189:Haemonchus; D010028:Ostertagia; D012756:Sheep; D034561:Sheep, Domestic