Long-period quasi-periodic oscillations of a small-scale magnetic structure on the Sun D. Y. Kolotkov, V. V. Smirnova, P. V. Strekalova, A. Riehokainen and V. M. Nakariakov A&A, 598 (2017) L2 Published online: 26 January 2017 DOI: 10.1051/0004-6361/201629951