Integrals over products of G-spinors

We have seen that charge-current overlap densities are essentially products of the form 

This leads to important computational savings later. Algorithms for evaluating the integrals [p,P r,y,t, Q 0,0,0] are described in [107] and [110]. 

With this notation, it is easy to derive a formula for the electron-nuclear interaction due to nucleus A , assuming a Gaussian nuclear charge distribution given by (110). The formula 

---