1. A trial to estimate the potency of FMD vaccines by means of serum antibody assays with sera from groups of vaccinated cattle;Ahl;Session of the Research Group of the European Commission for the Control of Foot-and-Mouth Disease,1983
2. Assessment of potency of foot-and-mouth disease vaccines by means of antibody assays with sera from vaccinated cattle;Ahl;Session of the Research Group of the European Commission for the Control of Foot-and-Mouth Disease,1988
3. Ahl R, Haas B, Lorenz RJ, Wittmann G. Final version of an alternative potency test of FMD vaccines and results of comparative antibody assays in different cell systems and ELISA. Session of the Research Group of the European Commission for the Control of Foot-and-Mouth Disease, Lindholm, Denmark, 25–29 June. (In press).
4. Some statistical and experimental design problems in the assessment of FMD vaccine potency;Pay;Develop Biol Stand,1977
5. The correlation of 140S antigen dose with the serum neutralising antibody response and with protection from challenge induced by FMD vaccines;Pay;Session of the Research Group of the European Commission for the Control of Foot-and-Mouth Disease,1983