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"All trees are 1-embeddable and all except stars are 2-embeddable."
C. R. J. Clapham, J. Sheehan (1993)
- C. R. J. Clapham, J. Sheehan:
All trees are 1-embeddable and all except stars are 2-embeddable. Discret. Math. 120(1-3): 253-259 (1993)
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