Assessing of use of the Internet for personal reasons at lessons at school: A Validation of the Cyberloafing ScaleNadezhda Sivrikova, Svetlana Roslyakova, Nadezhda Sokolova and Elena MoiseevaSHS Web Conf., 70 (2019) 06010DOI: https://doi.org/10.1051/shsconf/20197006010