, 2015a, Freedom in a box: paradoxes in the structure of extraterrestrial liberty, in C. S. Cockell (ed.), The meaning of liberty beyond earth, Dordrecht, Springer, pp. 47-68.
, 2015b, Introduction: the meaning of liberty beyond the earth, in C. S. Cockell (ed.), The meaning of liberty beyond earth, Dordrecht, Springer, pp. 1-9.
(ed) , 2015a, The meaning of liberty beyond earth, Springer, Dordrecht.