Prediction of the California bearing ratio (CBR) of compacted soils by using GMDH-type neural network T. Fikret Kurnaz and Yilmaz Kaya Eur. Phys. J. Plus, 134 7 (2019) 326 Published online: 10 July 2019 DOI: 10.1140/epjp/i2019-12692-0