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Parr, M.K.; Zapp, J.; Becker, M.; Opfermann, G.; Bartz, U.; Schanzer, W., Steroidal isomers with uniform mass spectra of their per-TMS derivatives: Synthesis of 17-hydroxyandrostan-3-ones, androst-1-, and -4-ene-3,17-diols, Steroids, 2007, 72, 6-7, 545-551, https://doi.org/10.1016/j.steroids.2007.03.006 . [all data]