@article{ref1,
title="Bullying and cyberbullying: protective factors and effective interventions",
journal="Aggression and violent behavior",
year="2019",
author="Zych, Izabela and Farrington, David P. and Ttofi, Maria M.",
volume="45",
number="",
pages="1-3",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="1359-1789",
doi="10.1016/j.avb.2018.08.006",
url="http://dx.doi.org/10.1016/j.avb.2018.08.006"
}