1. Observations on ostertagiasis in young cattle over two grazing seasons with special reference to plasma pepsinogen levels;Armour;Vet. Rec.,1979
2. Evaluation of a simplified blood pepsinogen assay;Berghen;Am. J. Vet. Res.,1987
3. Evaluation of two control strategies with the oxfendazole pulse release bolus for the suppression of gastrointestinal parasitism in calves with special reference to gastrin and pepsinogen changes;Berghen;Vlaams Diergeneeskd. Tijdschr.,1989
4. Observations on parasitic gastroenteritis and parasitic bronchitis in calves over two grazing seasons;Berghen;Vet. Rec.,1990
5. Evaluation of pepsinogen, gastrin and antibody response in diagnosing ostertagiasis;Berghen;Vet. Parasitol.,1993