Geodesic
Width of groups of type $\mathrm E_6$ with respect to root elements.~II
Zapiski Nauchnykh Seminarov POMI, Problems in the theory of representations of algebras and groups. Part 20, Tome 386 (2011), pp. 242-264

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We consider simply-connected and adjoint groups of type $\mathrm E_6$ over fields. Let $K$ be a field such that every polynomial of degree at most 6 has a root in $K$. We prove that every element of an adjoint group of type $\mathrm E_6$ over $K$ can be written as a product of at most seven root elements. Bibl. 59 titles. 
@article{ZNSL_2011_386_a6,
     author = {I. M. Pevzner},
     title = {Width of groups of type $\mathrm E_6$ with respect to root {elements.~II}},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {242--264},
     publisher = {mathdoc},
     volume = {386},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2011_386_a6/}
}
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I. M. Pevzner. Width of groups of type $\mathrm E_6$ with respect to root elements.~II. Zapiski Nauchnykh Seminarov POMI, Problems in the theory of representations of algebras and groups. Part 20, Tome 386 (2011), pp. 242-264. http://geodesic.mathdoc.fr/item/ZNSL_2011_386_a6/