You can download the latest source code from the sourceforge summary page
Some information about the genetic algorithm joint inversion code can be found in: Moorkamp, M., A. G. Jones, and D. W. Eaton (2007), Joint inversion of teleseismic receiver functions and magnetotelluric data using a genetic algorithm: Are seismic velocities and electrical conductivities compatible?, Geophys. Res. Lett., 34, L16311, doi:10.1029/2007GL030519.
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