The basis for this article is an article in Fornvännen 1983 
http://fornvannen.se/pdf/1980talet/1983_021.pdf
This article was edited and approved by the previous editor of Fornvännen Fil Dr Jan-Peder Lamm 
Fornvännen is a highly reputable magazine
Göran H. wrote the article in 1982.  Jan-Peder Lamm edited the article but  suggested that Göran H. should include a comparison with Stonehenge. Therefore did J-P L supply Göran H. with archaeological history about Stonehenge. Göran H. re-wrote the article with comparison with Stonhenge and the article was published in 1983.

Jan-Peder Lamm, born 27 October 1935, is a Swedish archaeologist. He received his PhD in 1973 from the University of Stockholm for a dissertation about a Migration Period elite cemetery near Drottningholm.
Lamm taught archaeology at the University of Stockholm in the 1970s and then worked until retirement as Head Curator for the Swedish Iron Age at the Museum of National Antiquities in Stockholm. He is a member of the editorial board behind the journal Fornvännen and has taken active part in the Helgö project since the 1960s.
Fornvännen (print: ISSN 0015-7813, online: ISSN 1404-9430) is a Swedish academic journal in the fields of archaeology and Medieval art. It is published quarterly by the Royal Swedish Academy of Letters in Stockholm, Sweden. The journal's contributions are written in the Scandinavian languages, English, or German with summaries in English. Fornvännen has the alternate title Journal of Swedish Antiquarian Research. The editor in chief is Lars Larsson.
Fornvännen began publication in 1906 when it replaced two earlier journals, Svenska Fornminnesföreningens Tidskrift and Vitterhetsakademiens Månadsblad. Early contributors included noted archaeologists Oscar Montelius and Hans Hildebrand.[1] Since 2000 it has an online version, since 2007 its first 100 annual volumes have been available on-line, and since 2009 Fornvännen is published as a delayed open-access journal with the online version of each issue appearing six months after the paper version.
Fornvännen is an ERIH category B journal. According to Ulrich's, it is indexed in Anthropological Index Online, Anthropological Literature, British & Irish Archaeological Bibliography (Online Edition), Nordic Archaeological Abstracts, and FRANCIS. It was previously also indexed in Internationale Bibliographie der Rezensionen Geistes- und Sozialwissenschaftlicher Literatur and Linguistic Bibliography.[2]
Henriksson, Göran. The grooves on the island of Gotland in the Baltic sea: a neolithic lunar calendar. Paper presented at Conference: SEAC 8th. Moscow 2000 Publisher: Institute of Archaeology. Russian Academy of Sciences. Title: Astronomy of Ancient Civilizations ISBN: 5-02-008768-8 Editor(s): Prof. Tamila Potemkina & Prof. V. Obridko
Gotländskt Arkiv is the official yearbook for the Gotlandic Heritage Board, Föreningen Gotlands Fornvänner