POTATO BLIGHT FORECASTING IN CUMBERLAND, 1953–57 - Croxall, H. E.; Davey, W. A.; Gwynne, D. C.; Johnson, W. (Blackwell Publishing Ltd, 1961)
http://dx.doi.org/10.1111/j.1365-3059.1961.tb00134.x
Keywords: ZA-ZE