In case you are curious, here is the algorithm from that 1957 text book (2nd edition): https://archive.org/details/programsforelect00wilk/page/190/mode/2up?q=Gi

In case you are curious, here is the algorithm from that 1957 text book (2nd edition): https://archive.org/details/programsforelect00wilk/page/190/mode/2up?q=Gillies https://archive.org/details/programsforelect00wilk/page/190/... I never did sit down and figure out the notation. It isn't in the 1951 (1st edition), at https://archive.org/details/preparationofpro0000maur https://archive.org/details/preparationofpro0000maur