equations for a printed rectangular inductor

Hello

I m looking for equations used to calculate the inductance of a printed rectangular inductor, I have found models and calculators for square coil but not for rectangular ones.

there is a method consisting in calculate the self inductance and mutual ones defining the coil but it seems diffucult and demands lot of time

any help please

K. Steinberg, M. Scheffler, and M. Dressel, ?Microwave inductance of thin metal strips?, IEEE Transactions on Microwave Theory and Techniques, Vol. 47, No. 8, 1999.

10x for your answer

Grover method and Greenhouse algorthim are good ways to calculate the inductance of rectangular coil

http://www.st.com/web/catalog/tools/...C1871/PF257518