TY - RPRT TI - Nonlinear wave solutions to the planar vacuum Einstein equations. AU - P Anninos AU - J Centrella AU - RA Matzner PY - 1991 DO - 10.1103/physrevd.43.1825 UR - https://pubmed.ncbi.nlm.nih.gov/10013558/ ID - 10013558 ER -