Revisiting the Westerlund 2 field with the HESS telescope array - Abramowski, A.; Acero, F.; Aharonian, F.; Akhperjanian, A.; Anton, G.; Barnacka, A.; Barres de Almeida, U.; Bazer-Bachi, A.; Becherini, Y.; Becker Tjus, J.; Behera, B.; Bernlöhr, K.; et al. (EDP Sciences, 2011)