Balls on the lawn.
Mallows, Colin L. ; Shapiro, Lou
Journal of Integer Sequences [electronic only], Tome 2 (1999), / Harvested from The Electronic Library of Mathematics
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Publié le : 1999-01-01
EUDML-ID : urn:eudml:doc:233465 
@article{01300641,
     title = {Balls on the lawn.},
     journal = {Journal of Integer Sequences [electronic only]},
     volume = {2},
     year = {1999},
     zbl = {0923.05004},
     language = {en},
     url = {http://dml.mathdoc.fr/item/01300641}
}

Mallows, Colin L.; Shapiro, Lou. Balls on the lawn.. Journal of Integer Sequences [electronic only], Tome 2 (1999) . http://gdmltest.u-ga.fr/item/01300641/