1. M. Schmela, Photon Int. February, 2, (2006)
2. M. Schmela, Photon Int. March Issue, 3, pp. 46–53, (2004a);
3. Photon Int. April Issue, 4, pp. 20–41, (2004b);
4. Photon Int. February Issue, 2, pp. 48–67, (2005a);
5. Photon Int. March Issue, 3, pp. 66–82, (2005b);