Considerations on finding the rolling and spinning friction coefficientsFlorina-Carmen Ciornei, Stelian Alaci, Sorinel-Toderas Siretean, Mariana-Catalina Ciornei, Ioan-Bogdan Dragoi and Vlăduţ-Constantin LazărMATEC Web Conf., 184 (2018) 01009DOI: https://doi.org/10.1051/matecconf/201818401009