Book References:

1. J. Stellwagen and N. C. Stellwagen, “Internal Structure of the Agarose Gel Matrix,” J. Phys. Chem., 1995, 99, pp 4247–4251.
2. M. Maaloum, N. Pernodet, and B. Tinland, “Agarose gel structure using atomic force microscopy: Gel concentration and ionic strength effects,” Electrophoresis, 1998, 19 (10), pp. 1606–1610.
3. G. A. Griess, K. B. Guiseley, M. M. Miller, R. A. Harris, and P. Serwer, “The Formation of Small-Pore Gels by an Electrically Charged Agarose Derivative”, J. Struct. Biol. 1998, 123, 134–142.

Web References:

1. Gel Electrophoresis
2. Introduction to Agar
3. Gel: Wikipedia
4. The conundrum of gel formation
5. Agar Gel Electrophoresis
6. What is Jell-O?
7. GEL