MVN 
The page looks excellent. It is quite impressive. And yes - while much is standard textbook material ... some is not ... and perhaps that is the point ... formulae are being given without reference or citation or derivation/proof, and in the absence of same, it is not clear if such formulae are  'original' or if they are sourced.  
And if they are sourced, where/what is the source? It would be helpful if the source could be provided. All the best.