1. Current exchanges and unconstrained higher spins
2. R. Argurio, G. Barnich, G. Bonelli, M. Grigoriev (Eds.), Higher-Spin Gauge Theories (Int. Solvay Institutes, 2006) Collects the Proceedings of the Ist Solvay Workshop, Held in Brussels on 12–14 May 2004, contains a number of contributions closely related, in spirit, to the present paper