Wouter Van Haaften; The Justification of Conceptual Development Claims, Journal of Philosophy of Education, Volume 24, Issue 1, 30 May 2006, Pages 51–70, https.

This paper makes a small point concerning the contraposition of relativism and absolutism. Relativism need not be vulnerable to the self‐refutation argument; as for internal consistency both positions can be equally right. They are asymmetric, however, in that according to the absolutist only one of the two positions can be right, whereas from the relativist's viewpoint they can both be right.