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| url = http://www.princeton.edu/~jacobfox/papers/stringpartial071709.pdf
| year = 2009}}.
*{{citation▼
| first = R. L. | last = Graham | authorlink = Ron Graham▼
| contribution = Problem 1▼
| title = Open Problems at 5th Hungarian Colloquium on Combinatorics▼
| country = Hungary▼
| year = 1976}}.▼
*{{citation
| first1 = M. | last1 = Golumbic | first2 = D. | last2 = Rotem | first3 = J. | last3 = Urrutia
Line 67 ⟶ 61:
| issue = 1
| doi = 10.1016/0012-365X(83)90019-5}}.
▲*{{citation
▲ | first = R. L. | last = Graham | authorlink = Ron Graham
▲ | contribution = Problem 1
▲ | title = Open Problems at 5th Hungarian Colloquium on Combinatorics
▲ | country = Hungary
▲ | year = 1976}}.
*{{citation
| first = Jan | last = Kratochvil
| |||