Problems of posting sentries: Variations on the art gallery theorem
1993 ◽
Vol 14
(9)
◽
pp. 727-732
◽
1985 ◽
Vol 17
(2)
◽
pp. 141-149
2009 ◽
Vol 109
(13)
◽
pp. 719-721
◽
1986 ◽
Vol 7
(3)
◽
pp. 452-454
◽
2012 ◽
Vol 48
(3)
◽
pp. 711-720
◽