Albarède F., Stracke A., Salters V.J.M., Weis D., Blichert-Toft J., Télouk P., Agranier A. Comment to “Pb isotopic analysis of standards and samples using a 207Pb-204Pb double spike and thallium to correct for mass bias with a double-focusing MC-ICP-MS” by Baker et al. Chem. Geol., 217, 171-174, 2005.