References
Hajnal Andréka
with Németi, I. (2015)., Finite-variable logics do not have weak beth definability property, in A. Koslow & A. Buchsbaum (eds.), The road to universal logic II, Basel, Birkhäuser, pp. 125-133.
with Németi, I. , Székely, G. , Madarász, J. (2012). A logic road from special relativity to general relativity. Synthese 186 (3), pp. 633-649.