Buy article online - an online subscription or single-article purchase is required to access this article.
research papers
It is argued that magnetic structures are likely to be found which will most fruitfully be explained with the aid of non-crystallographic magnetic point groups. The point groups are classified into families of `halving subgroups' and it is shown diagrammatically, with the aid of representation theory, how non-crystallographic Shubnikov groups can be constructed.