How can you drive the metric of kaluza klein in 5 D?

[optic27h]

in many research of kaluza klein theory to unified electromagnetic & gravity fields these research begin with 5D metric how can i drive this metric? please any research drive this metric show me.
note russian research's by english is very good if you know it show me .
please it is very important

[Mentz114]

Try this for a start

http://en.wikipedia.org/wiki/Kaluza%E2%80%93Klein_theory

and this for afters

http://www.het.brown.edu/people/danieldf/literary/eric-KKtheories.pdf