Most of the publications are in German that could not read or understand. I am basically searching for a method to produce trichromy starting from the origins.
You can read for example the book: Hans G. Vælz Industrial Color Testing. Obviously is used comparison of SUMs of K/S, alternatively weighted K/S by standard observer function. Other way is based on colorimetric data, for example Gall method, which is based on DIN6164 color space.
Please accept my sincere thanks for the valuable information. I have already started to search through your references. Hope, i will have the chance to thank you properly.