Detection of HCN, HCO+, and HNC in the Mrk 231 molecular outflow - Dense molecular gas in the AGN windS. Aalto, S. Garcia-Burillo, S. Muller, J. M. Winters, P. van der Werf, C. Henkel, F. Costagliola and R. NeriA&A, 537 (2012) A44DOI: https://doi.org/10.1051/0004-6361/201117919