Higher derivative extensions of 3d Chern–Simons models: conservation laws and stability D. S. Kaparulin, I. Yu. Karataeva and S. L. Lyakhovich Eur. Phys. J. C, 75 11 (2015) 552 Published online: 25 November 2015 DOI: 10.1140/epjc/s10052-015-3790-1