A semigroup approach to the road coloring problem
2000 ◽
pp. 195-207
◽
2011 ◽
Vol 111
(7)
◽
pp. 342-347
◽
2001 ◽
Vol 123
(1)
◽
pp. 303-316
◽
2009 ◽
Vol 172
(1)
◽
pp. 51-60
◽
1994 ◽
pp. 105-112
◽
1990 ◽
Vol 110
(4)
◽
pp. 1133-1133
◽