Mass, linear momentum and kinetic energy of bipolar flows in protoplanetary nebulae V. Bujarrabal, A. Castro-Carrizo, J. Alcolea and C. Sánchez Contreras A&A, 377 3 (2001) 868-897 Published online: 15 October 2001 DOI: 10.1051/0004-6361:20011090