The report comparing Denmark and Switzerland used to be here (in Danish): http://dkch.info/ – the website has now expired.
The report is available as a booklet in Danish “Det Gode Samfund” ISBN 978-87-996203-0-2
This link about Wartenweiler’s folk high school has disappeared too: http://www.herzberg.org/tl_files/herzberg/pdf_flyer/broschueren/Herzberg_FWLebenslauf.pdf but www.hertzberg.org is still around.
https://esa.un.org/unpd/wpp/Publications/Files/WPP2017_KeyFindings.pdf
https://en.wikipedia.org/wiki/Women’s_suffrage_in_Switzerland
https://de.wikipedia.org/wiki/Fritz_Wartenweiler