Aspects of φ-meson production in proton-proton collisions A. Sibirtsev, J. Haidenbauer and U. -G. Meißner Eur. Phys. J. A, 27 3 (2006) 263-268 Published online: 10 April 2006 DOI: 10.1140/epja/i2005-10269-9