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+The present source code was written to reproduce the original results from
+
+"Gravitational waves in general relativity, VII. Waves from axi-symmetric isolated system"
+1962 - Bondi, Hermann and Van der Burg, M. G. J. and Metzner, A. W. K.
+
+and is intended to be used with maxima. The scripts require a common lisp
+implementation supporting UTF-8 due to the use of greek characters.
+
+Maxima can be downloaded from:
+https://maxima.sourceforge.io/