On a conjecture about nine points in the boundary of a plane convex body at pairwise relative distances not greater than $${4 \, {\rm sin}\frac{\pi}{18}}$$
1951 ◽
Vol 47
(1)
◽
pp. 245-247
◽
Keyword(s):
2005 ◽
Vol 42
(3)
◽
pp. 253-264
Keyword(s):
1969 ◽
Vol 76
(1)
◽
pp. 54-55
◽
2012 ◽
Vol 54
(2)
◽
pp. 643-649