Effects of "extra-mixing" processes on the periods of high-order gravity   modes in main-sequence stars
  In main-sequence stars, the chemical composition gradient that develops at the edge of the convective core is responsible for a non-uniform period spacing of high-order gravity modes. In this work we investigate, in the case of a 1.6 Msun star, the effects on the period-spacing of extra mixing processes in the core (such as diffusion and overshooting). 
A. Miglio, J. Montalban and A. Noels