J Am Chem Soc. 2012 Mar 14;134(10):4983-9. doi:10.1021/ja300460p

Rossow T, Heyman JA, Ehrlicher AJ, Langhoff A, Weitz DA, Haag R, Seiffert S.

Controlled synthesis of cell-laden microgels by radical-free gelation in droplet microfluidics.

Micrometer-sized particles.