How can I find Math.Net Numerics Technical Theory or Referance

I’m working on a project and in this project I’m using in Math.Net Numerics Interpolate class.
Then, I want to learn that how can i find technical referance.
For example;
Math.Net Numerics akima spline can be found as a Hiroshi Akhima.
But the others such a cubic, normal, linear spline. Which equations can be counted as a refer to the results