There are no abstract objects
Cian Dorr
On "Exchange"
Joseph Déjacque & Pierre-Joseph Proudhon
Sanity, Madness and the Family
R. D. Laing & Aaron Esterson
The Semantic Paradoxes & the Paradoxes of Vagueness
Hartry Field
A Fisherman of the Inland Sea: Stories
Ursula K. Le Guin