“…Theories involving one or several spin-two fields have raised a constant interest over the last thirty years, especially at the level of direct or intermediated graviton interactions [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18]. In this context more results on the impossibility of consistent cross-couplings among different gravitons have been obtained, either without other fields [14] or in the presence of a scalar field [14], a Dirac spinor [15], or respectively of a massive Rarita-Schwinger field [16].…”