[arXiv:0808.2155 [hep-th]]. [160] S. Fedoruk and J. Lukierski, "Maxwell group and HS field theory," arXiv:1309.6878 [hep-th]. [161] S. Fedoruk and V. G. Zima, "Bitwistor formulation of massive spinning particle," hep- th/0308154. [162] A. R. Cover, A. Shaukat and A. Waldron, "Tractors, Mass and Weyl Invar