First detection of H2S in a protoplanetary disk - The dense GG Tauri A ringN. T. Phuong, E. Chapillon, L. Majumdar, A. Dutrey, S. Guilloteau, V. Piétu, V. Wakelam, P. N. Diep, Y.-W. Tang, T. Beck and J. BaryA&A, 616 (2018) L5DOI: https://doi.org/10.1051/0004-6361/201833766