1. The Colloid Chemistry of Silica;Ferch,1994
2. Packings and Stationary Phases in chromatographic separation techniques;Unger,1989
3. HPLC of Proteins, Peptides and Polynucleotides;Unger,1991
4. Highly Selective Separations in Biotechnology;Liapis,1994
5. R. Ditz, Merck KGaA, SLP Products, Darmstadt, oral communication