Fast outflows in protoplanetary nebulae and young planetary nebulae observed by Herschel/HIFI M. Lorenzo, D. Teyssier, V. Bujarrabal, P. García-Lario, J. Alcolea, E. Verdugo and A. Marston A&A, 649 (2021) A164 Published online: 02 June 2021 DOI: 10.1051/0004-6361/202039592