Geodesic
On Strong Upper Densities
Canadian mathematical bulletin, Tome 12 (1969) no. 4, pp. 509-510

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Let ψ be the outer measure generated by a gauge g and a sequential covering class C of closed sets of a metric space X, and let D be the resulting strong upper density function. That is, for each A ⊆ X and each x ∈ X: the infimum being taken over all countable subcollections {Iα} of C such that and, for all Iα in the subcollection, d(Iα) < ε where d(Iα) is the diameter of d(Iα). 
Eames, W. On Strong Upper Densities. Canadian mathematical bulletin, Tome 12 (1969) no. 4, pp. 509-510. doi: 10.4153/CMB-1969-066-8
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     title = {On {Strong} {Upper} {Densities}},
     journal = {Canadian mathematical bulletin},
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     year = {1969},
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     number = {4},
     doi = {10.4153/CMB-1969-066-8},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1969-066-8/}
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