LAPACK 3.12.0
LAPACK: Linear Algebra PACKage

Functions  
subroutine  dlaqtr (ltran, lreal, n, t, ldt, b, w, scale, x, work, info) 
DLAQTR solves a real quasitriangular system of equations, or a complex quasitriangular system of special form, in real arithmetic.  
subroutine  slaqtr (ltran, lreal, n, t, ldt, b, w, scale, x, work, info) 
SLAQTR solves a real quasitriangular system of equations, or a complex quasitriangular system of special form, in real arithmetic.  