Magnetic collimation of the relativistic jet in M 87. \aap, (442):L7-L10, November 2005. [PUMA: 2005 astro hlrs myown spmt]
Effects of a solid surface on jet formation around neutron stars. \aap, (436):607-613, June 2005. [PUMA: 2005 astro hlrs myown spmt]