I. Schmelzer (2012). "A Generalization of the Lorentz Ether to Gravity with General-Relativistic Limit". Advances in Applied Clifford Algebras. 22: 203–242. doi:10.1007/s00006-011-0303-7. ISSN0188-7009.
I. Schmelzer (2012). "A Generalization of the Lorentz Ether to Gravity with General-Relativistic Limit". Advances in Applied Clifford Algebras. 22: 203–242. doi:10.1007/s00006-011-0303-7. ISSN0188-7009.