1. M. I. Bašmakov, Cohomology of Abelian varieties over a number field, Uspehi Matematičeskih Nauk 27 (1972), 25–66. English translation: Russian Mathematical Surveys 27 (1972), 6, 25–70.
2. J. W. S. Cassels, Arithmetic on curves of genus 1. IV. Proof of the Hauptvermutung, Journal für die Reine und Angewandte Mathematik 211 (1962), 95–112.
3. P. L. Clark, The period-index problem in WC-groups. II, preprint, http://math.uga.edu/pete/wc2.pde .
4. P. L. Clark, There are genus one curves of every index over every number field, Journal für die Reine und Angewandte Mathematik 594 (2006), 201–206.
5. J.-L. Colliot-Thélène and J.-J. Sansuc, La descente sur les variétés rationnelles. II, Duke Mathematical Journal 54 (1987), 375–492.