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Journal Article
Baekler, Peter, Favaro, Alberto, Itin, Yakov and Hehl, Friedrich W. ORCID: 0000-0003-2503-4744 (2014). The Kummer tensor density in electrodynamics and in gravity. Ann. Phys., 349. S. 297 - 325. SAN DIEGO: ACADEMIC PRESS INC ELSEVIER SCIENCE. ISSN 1096-035X
Baekler, Peter and Hehl, Friedrich W. ORCID: 0000-0003-2503-4744 (2011). Beyond Einstein-Cartan gravity: quadratic torsion and curvature invariants with even and odd parity including all boundary terms. Class. Quantum Gravity, 28 (21). BRISTOL: IOP PUBLISHING LTD. ISSN 1361-6382