Michael Banks, of the MPI for Solid State Research in Stuttgart, has calculated the now familiar h-index (or Hirsch index) for some chemical compounds and topics in physics.

He proposes a new measure, m, which is the h-index for a topic divided by the number of years since it first appeared in print. Gallium nitride and buckminsterfullerene top the chemical compounds, with m-indices of 2.12 and 5.10 respectively.

As for topics in physics, carbon nanotubes, nanowires and quantum dots come first with ms of 12.85, 8.75 and 7.84.

(Source: Nature, 2006, 441, 265.)