diff --git a/notes/cruzan_coeffs.m b/notes/cruzan_coeffs.m
new file mode 100644
index 0000000..db4a1ff
--- /dev/null
+++ b/notes/cruzan_coeffs.m
@@ -0,0 +1,12 @@
+(* Vector translation coefficients as in Journal of Computational Physics 139, 137--165 (1998), eqs. (58), (59), (61) *)
+gaunt[m_, n_, mu_, nu_, 
+   p_] := (-1)^(m + mu) (2 p + 1) Sqrt[
+    Factorial[n + m] Factorial[
+      nu + mu] Factorial[p - m - mu]/Factorial[n - m]/
+      Factorial[nu - mu] / Factorial[p + m + mu]] ThreeJSymbol[{n, 
+     0}, {nu, 0}, {p, 0}] ThreeJSymbol[{n, m}, {nu, 
+     mu}, {p, -m - mu}];
+bCXcoeff[m_,n_,mu_,nu_,p_]:=(-1)^(mu+m)(2p+3)Sqrt[(n+m)!(nu+mu)!(p-m-mu+1)!/(n-m)!/(nu-mu)!/(p+m+mu+1)!]ThreeJSymbol[{n,m},{nu,mu},{p+1,-m-mu}]ThreeJSymbol[{n,0},{nu,0},{p,0}]
+p[q_,n_,nu_]:=n+nu-2q;
+ACXcoeff[m_,n_,mu_,nu_,q_]:=(-1)^m (2nu+1)(nu+m)!(nu-mu)!/2/n/(nu+1)/(nu-m)!/(nu+m)!I^p[q,n,nu](n(n+1)+nu(nu+1)-p[q,n,nu](p[q,n,nu]+1))gaunt[-m,n,mu,nu,p[q,n,nu]]
+BCXcoeff[m_,n_,mu_,nu_,q_]:=(-1)^(m+1)(2nu+1)(n+m)!(nu-m)!/2/n/(n+1)/(n-m)!(nu+mu)!I^(p[q,n,nu]+1)Sqrt[((p[q,n,nu]+1)^2-(n-nu)^2)((n+nu+1)^2-(p[q,n,nu]+1)^2)]bCXcoeff[-m,n,mu,nu,p[q,n,nu]]`