@inproceedings{993a366c94054d6db33ea0e905d6ac5a,
title = "Some unitals on 28 points and their embeddings in projective planes of order 9",
author = "A.E. Brouwer",
year = "1981",
doi = "10.1007/BFb0091018",
language = "English",
isbn = "3-540-11166-2",
series = "Lecture Notes in Mathematics",
publisher = "Springer",
pages = "183--188",
editor = "M. Aigner and D. Jungnickel",
booktitle = "Geometries and Groups (Proceedings of a Colloquium held at the Freie Universit{\"a}t Berlin, May 1981)",
address = "Germany",
}