The paper computes exact outerplanar Turán numbers ex_OP(n, S_p,q) for q ≥ p ≥ 2 except p=2 q=3, where only a lower bound is shown.
An improved upper bound for planar Tur´ an number of double star S2,5
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The Outerplanar Tur\'{a}n Number of Double Stars
The paper computes exact outerplanar Turán numbers ex_OP(n, S_p,q) for q ≥ p ≥ 2 except p=2 q=3, where only a lower bound is shown.