Geodesic
A bound on the number of leaves in a spanning tree of a connected graph of minimal degree 6
Zapiski Nauchnykh Seminarov POMI, Combinatorics and graph theory. Part IX, Tome 464 (2017), pp. 112-131 Cet article a éte moissonné depuis la source Math-Net.Ru

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It is proved, that a connected graph of minimal degree 6 has a spanning tree, such that at least $\frac{11}{21}$ of its vertices are leaves. 
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E. N. Simarova. A bound on the number of leaves in a spanning tree of a connected graph of minimal degree 6. Zapiski Nauchnykh Seminarov POMI, Combinatorics and graph theory. Part IX, Tome 464 (2017), pp. 112-131. http://geodesic.mathdoc.fr/item/ZNSL_2017_464_a6/

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