Add Maximal Isotropic (Horizon Penetrating) Schwarzschild coordinates

to the Schwarzschild AnalyticSolution for the XCTS system.

docs/References.bib

@@ -182,6 +182,20 @@ @article{Baumgarte2006ug
   SLACcitation   = "%%CITATION = GR-QC/0610120;%%"
 }
 
+@article{Baumgarte2007ht,
+    author = "Baumgarte, Thomas W. and Naculich, Stephen G.",
+    title = "{Analytical representation of a black hole puncture solution}",
+    eprint = "gr-qc/0701037",
+    archivePrefix = "arXiv",
+    reportNumber = "BOW-PH-138",
+    doi = "10.1103/PhysRevD.75.067502",
+    url = {https://doi.org/10.1103/PhysRevD.75.067502},
+    journal = "Phys. Rev. D",
+    volume = "75",
+    pages = "067502",
+    year = "2007"
+}
+
 @book{BaumgarteShapiro,
   author    = {Baumgarte, Thomas W. and Shapiro, Stuart L.},
   title     = {Numerical Relativity: Solving {Einstein's} Equations on the
@@ -885,6 +899,19 @@ @article{Dumbser2017okk
     year = "2018"
 }
 
+@article{Estabrook1973ue,
+    author = "{Estabrook, Frank and Wahlquist, Hugo and Christensen, Steven and
+               DeWitt, Bryce and Smarr, Larry and Tsiang, Elaine}",
+    title = "{Maximally slicing a black hole}",
+    doi = "10.1103/PhysRevD.7.2814",
+    url = "https://doi.org/10.1103/PhysRevD.7.2814",
+    journal = "Phys. Rev. D",
+    volume = "7",
+    pages = "2814--2817",
+    year = "1973"
+}
+
+
 @article{Etienne2008re,
   author        = {Etienne, Zachariah B. and Liu, Yuk Tung and Shapiro, Stuart
                    L. and Baumgarte, Thomas W.},