For a crosstable of the tournament, see 1957-1960 Zonal Cycle (C04, Z04). To play through the moves of the game, see Boris Spassky vs Mikhail Tal; USSR Championship (1958), Riga URS (chessgames.com).
The 'Chess Panorama' excerpt mentions the book 'Spassky's 100 Best Games' by Bruce Cafferty. That should of course be Bernard Cafferty, who also mentioned other last round incidents of the same genre. I'll cover those in another post.