1. N. Keegan, W. Schneider, H.-P. Krug, J. Moritz and V. Dopp, “Evaluation of Ceramic Foam and Bonded Particle Cartridge Filtration systems”, JOM, Volume 48, No. 8 (1996), p. 28–30
2. N. Keegan, W. Schneider, H.-P. Krug and V. Dopp, “Evaluation of the Efficiency of Ceramic Foam and Bounded Particle Cartridge Filtration Systems”, Light Metals 1997, p. 973–982
3. W. Schneider, H.-P. Krug, N. Keegan, “Untersuchung der Wirksamkeit verschiedener Filtertypen für die Filtration von Al-Schmelzen — Teil 1”, Aluminium 74 (1998) p. 40–44
4. W. Schneider, H.-P. Krug, N. Keegan, “Untersuchung der Wirksamkeit verschiedener Filtertypen für die Filtration von Al-Schmelzen — Teil 2”, Aluminium 74 (1998) p. 142–147
5. H.-P. Krug and W. Schneider, “A Contribution to Inclusion Measurement after In-line Degassers with PoDFa and LiMCA”, Light Metals 1998, p. 863–870