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Ciardi, B. Cosmology, MPI for Astrophysics, Max Planck Society;
Campisi, M. A., Maio, U., Salvaterra, R., & Ciardi, B. (2011). Population III stars and the long gamma-ray burst rate. Monthly Notices of the Royal Astronomical Society, 416(4), 2760-2767. doi:10.1111/j.1365-2966.2011.19238.x.