@article{Spitzer_2021,<br/><span class="tab"></span> title={Academic performance of K-12 students in an online-learning environment for mathematics increased during the shutdown of schools in wake of the COVID-19 pandemic},<br/><span class="tab"></span> volume={16},<br/><span class="tab"></span> ISSN={1932-6203},<br/><span class="tab"></span> url={http://dx.doi.org/10.1371/journal.pone.0255629},<br/><span class="tab"></span> DOI={10.1371/journal.pone.0255629},<br/><span class="tab"></span> number={8},<br/><span class="tab"></span> journal={PLOS ONE},<br/><span class="tab"></span> publisher={Public Library of Science (PLoS)},<br/><span class="tab"></span> author={Spitzer,<br/><span class="tab"></span> Markus Wolfgang Hermann and Musslick,<br/><span class="tab"></span> Sebastian},<br/><span class="tab"></span> editor={Petri,<br/><span class="tab"></span> Giovanni},<br/><span class="tab"></span> year={2021},<br/><span class="tab"></span> month=aug,<br/><span class="tab"></span> pages={e0255629} }