1. Armstrong DM (1978) Universals and scientific realism I-II. Cambridge University Press, Cambridge
2. Armstrong DM (1997) A world of states of affairs. Cambridge University Press, Cambridge
3. Ben-Yami H (2004) Logic and natural language: on plural reference and its semantic and logical significance. Ashgate, Aldershot
4. Findlay JN (1963) Meinong’s theory of objects and values. Clarendon Press, Oxford
5. Grossmann R (1983) The categorial structure of the world. Indiana University Press, Bloomington