Thomson, J. J. (tháng 3 năm 1904). "On the Structure of the Atom: an Investigation of the Stability and Periods of Oscillation of a number of Corpuscles arranged at equal intervals around the Circumference of a Circle; with Application of the Results to the Theory of Atomic Structure". Philosophical Magazine. Sixth. Quyển 7 số 39. tr. 237–265. doi:10.1080/14786440409463107.