AUTHOR=Treumann Rudolf A. , Baumjohann Wolfgang TITLE=Broad current sheets, current bifurcation, and collisionless reconnection—An Opinion on “Onset of fast magnetic reconnection via subcritical bifurcation” by Z. Guo and X. Wang JOURNAL=Frontiers in Physics VOLUME=3 YEAR=2015 URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2015.00040 DOI=10.3389/fphy.2015.00040 ISSN=2296-424X