When photocopying, the rules in article 12 of the Act on Copyright in Literary and Artistic Works (SFS 1960:729 in Swedish), apply for copying for personal use. Your own studies and research are covered by this.
ONLY LIMITED PARTS OF A BOOK MAY BE COPIED
For personal use you may make one or a few copies of articles or other minor documents. When copying from a normal sized book, e.g. a course book, you are only permitted to copy limited parts of the book.
There is no precise deﬁnition of “limited parts”. However, the text of the government bill (2004/05:110 p. 383 f) provides some guidance:
"A limited part is always deemed to be a small part of the work (=book) and not half, nor nearly half, of the work. Naturally it is not acceptable to circumvent this rule by making a copy of a limited part of a work one day and another part the following day."
The person making the copy is personally responsible both for interpreting the law and any legal consequences of breaking this rule that only limited parts of a book may be copied.