==References====External links==*Unsolved Problems in Nanotechnology: Chemical Processing by Self-Assembly - Matthew Tirrell - Departments of Chemical Engineering and Materials, Materials Research Laboratory, California NanoSystems Institute, University of California, Santa Barbara
* 10 problems for Chemistry in the 21st Century — French Chemical Society* Unsolved Problems in Nanotechnology: Chemical Processing by Self-Assembly — Matthew Tirrell — Departments of Chemical Engineering and Materials, Materials Research Laboratory, California NanoSystems Institute, University of California, Santa Barbara