sspgvx(3) on Linux
The text 3eb9b51abda4, as Debian 3.0 (Woody) shipped it.
compute selected eigenvalues, and optionally, eigenvectors of a real generalized symmetric-definite eigenproblem, of the form A*x=(lambda)*B*x, A*Bx=(lambda)*x, or B*A*x=(lambda)*x