LOFAR observations of PSR B0943+10: profile evolution and discovery of a systematically changing profile delay in bright mode
A. V. Bilous, J. W. T. Hessels, V. I. Kondratiev, J. van Leeuwen, B. W. Stappers, P. Weltevrede, H. Falcke, T. E. Hassall, M. Pilia, E. Keane, M. Kramer, J.-M. Grießmeier and M. Serylak
