Passive butterworth filter design

[Neutronium]

Hello,

I'm looking for a guide on the steps to design passive butterworth filters, specifically the steps on how to find the L and C passive elements using the butterworth polynomial, the cutoff frequency, and the terminating/load resistance. Is it necessary to use continued fractions? My 'textbook' is unclear and I can't seem to find any decent resource online.

Thanks

[Antiphon]

You end up solving polynomials. Here's Butterworth's paper. It's pretty readable.

http://www.expertran.com/butter/paper.pdf