dlasd4(3) on Linux
The text e50af9067ace, as Debian 3.0 (Woody) shipped it.
subroutine computes the square root of the I-th updated eigenvalue of a positive symmetric rank-one modification to a positive diagonal matrix whose entries are given as the squares of the corresponding entries in the array d, and that 0 <= D(i) < D(j) for i < j and that RHO > 0