Thornburg, Jonathan Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;
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Vitzthum, V. J., Spielvogel, H., & Thornburg, J. (2004). Interpopulational differences in progesterone levels during conception and implantation in humans. Proceedings of the National Academy of Sciences of the United States of America, 101(6), 1443-1448. doi:10.1073/pnas.0302640101.