Low-frequency variations of unknown origin in the Kepler δ Scuti star KIC 5988140 = HD 188774
P. Lampens, A. Tkachenko, H. Lehmann, J. Debosscher, C. Aerts, P. G. Beck, S. Bloemen, N. Kochiashvili, A. Derekas, J. C. Smith, P. Tenenbaum and J. D. Twicken
