The Net Advance of Physics:
KERR SOLUTION
KERR METRIC:
General:
Modern Relativity Page;
Bicak 2000/04;
Kerr Black Hole
[GRWiki]
The Universe in Problems: Kerr black hole
by Yu. L. Bolotin and I. V. Tanatarov [Problems for students.]
The Kerr spacetime: A brief introduction
by Matt Visser [2007/06]
Catalogue of Spacetimes
by Thomas Müller and Frank Grave [2009/04]
The Kerr Metric
by Saul A. Teukolsky [2014/10]
General: OBSERVATIONAL:
Sgr A*: The Optimal Testbed of Strong-Field Gravity
by Dimitrios Psaltis and Tim Johannsen [2010/06]
Testing the Kerr black hole hypothesis
by Cosimo Bambi [2011/09]
Type: CHARGED:
The Kerr-Newman Metric: A Review
by Tim Adamo and E. T. Newman [2014/10]
THE NET ADVANCE OF PHYSICS