@article{
    KaOs04d,
    author = {Kaski, Petteri and {\"O}sterg{\aa}rd, Patric R. J.},
    title = "There exist nonisomorphic {S}{T}{S}(19) with equivalent point codes",
    url = "http://dx.doi.org/10.1002/jcd.20007",
    journal = "Journal of Combinatorial Designs",
    number = "6",
    abstract = "The rows of a point by block incidence matrix of a design can be used to generate a code, the point code of the design. It is known that binary point codes of nonisomorphic Steiner triple systems of order $v$, STS($v$), are inequivalent when $v \leq 15$, but whether this also holds for higher orders has been open. In the current paper an example of two nonisomorphic STS(19) with equivalent point codes is presented.",
    volume = "12",
    year = "2004",
    keywords = "code equivalence, design isomorphism, point code, Steiner triple system",
    pages = "443--448"
}