Aydin, D., Schwieder, M., Louban, I., Knoppe, S., Ulmer, J., Haas, T. L., Walczak, H., & Spatz, J. P. (2009). Micro-nanostructured protein arrays: a tool for geometrically controlled single ligand presentation. Small, 5(9), 1014-1018. doi:10.1002/smll.200801219.