Baez, J. C. 2002. The octonions. Bulletin of the American Mathematical Society, 39(2), 145–205. 
https://doi.org/10.1090/S0273-0979-01-00934-X

Baez, J. C., Huerta, J. 2010. The algebra of Grand Unified Theories. Bulletin of the American Mathematical Society, 47(3), 483–552. 
https://doi.org/10.1090/S0273-0979-10-01294-2

Beltrán, J., Heisenberg, L., Koivisto, T. 2019. The geometrical trinity of gravity. Universe, 5(7), 173. 
https://doi.org/10.3390/universe5070173

Einstein, A. 1916. Die Grundlage der Allgemeinen Relativitätstheorie. Annalen der Physik, 354(7), 769–822. 
https://doi.org/10.1002/andp.19163540702

Gallagher, P., Koivisto, T., Marzola, L. 2022. Pregeometric first order Yang-Mills theory. Physical Review D, 105(12), 125010. 
https://doi.org/10.1103/PhysRevD.105.125010

Georgi, H., Glashow, S. L. 1974. Unity of all elementary-particle forces. Physical Review Letters, 32(8), 438–441. 
https://doi.org/10.1103/PhysRevLett.32.438

Koivisto, T. S., Hohmann, M., Marzola, L. 2021. Axiomatic derivation of coincident general relativity and its premetric extension. Physical Review D, 103(6), 064041.
https://doi.org/10.1103/PhysRevD.103.064041

Kuusk, P. 2019. Aegruum. Ilmamaa, Tartu.

Oziewicz, Z. 2014. Centre-of-mass for the finite speed of light. Journal of Physics: Conference Series, 532(1), 012021. 
https://doi.org/10.1088/1742-6596/532/1/012021

Penrose, R. 2016. Fashion, Faith, and Fantasy in the New Physics of the Universe. Princeton University Press. 

Złośnik, T., Urban, F., Marzola, L., Koivisto, T. 2018. Spacetime and dark matter from spontaneous breaking of Lorentz symmetry. Classical and Quantum Gravity, 35(23), 235003. 
https://doi.org/10.1088/1361-6382/aaea96