zpotrs(3) on Linux
The text 3b83e2d9cef8, as Debian 4.0 (Etch), Debian 3.1 (Sarge) shipped it.
solve a system of linear equations A*X = B with a Hermitian positive definite matrix A using the Cholesky factorization A = U**H*U or A = L*L**H computed by ZPOTRF