5-sparse Steiner triple systems of order n exist for almost all admissible n.
Wolfe, Adam
The Electronic Journal of Combinatorics [electronic only], Tome 12 (2005), / Harvested from The Electronic Library of Mathematics
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Publié le : 2005-01-01
EUDML-ID : urn:eudml:doc:125459 
@article{02248140,
     title = {5-sparse Steiner triple systems of order },
     journal = {The Electronic Journal of Combinatorics [electronic only]},
     volume = {12},
     year = {2005},
     zbl = {1079.05013},
     language = {en},
     url = {http://dml.mathdoc.fr/item/02248140}
}

Wolfe, Adam. 5-sparse Steiner triple systems of order . The Electronic Journal of Combinatorics [electronic only], Tome 12 (2005) . http://gdmltest.u-ga.fr/item/02248140/