David Wells, Are these the most beautiful?, Mathematical Intelligencer, 1990, br. 12, str. 37-41
David Wells, Which is the most beautiful?, Mathematical Intelligencer, 1988, br. 10, str. 30-31
Videti još: Ivars Peterson. „The Mathematical Tourist”. Arhivirano iz originala na datum 2007-03-31. Pristupljeno 19. 6. 2008.
David Wells, Are these the most beautiful?, Mathematical Intelligencer, 1990, br. 12, str. 37-41
David Wells, Which is the most beautiful?, Mathematical Intelligencer, 1988, br. 10, str. 30-31
Videti još: Ivars Peterson. „The Mathematical Tourist”. Arhivirano iz originala na datum 2007-03-31. Pristupljeno 19. 6. 2008.