@inproceedings { Gutman20180919,
author = "Gutman A.E.",
title = "Archimedean and directionally closed cones",
booktitle = "Дни геометрии в Новосибирске -- 2018. Международная конференция (Новосибирск, 19-22 сентября 2018 г.): Тез. докладов",
address = "Новосибирск",
publisher = "Изд-во Ин-та математики",
year = "2018",
isbn = "978-5-86134-220-9",
pages = "15",
annote = "A criterion is provided for a wedge to be Archimedean, which is based on the notion of closed set along a direction."
}