@book{ title = "Natursymboler i svensk lyrik från nyromantiken till Karlfeldt", author = "Hallberg, Peter", year = "1951", publisher = "Elander", address = "Göteborg", language = "swe", howpublished = "print", keywords = "Hochschulschrift", note = "Göteborg, Univ., Akad. avh., 1951", }