Quite rightly, over the last few days we have been honouring the memory of Rosa Luxemburg, but hagiography is not a Marxist genre and commemoration should always be allied to critical appreciation. In this spirit, I strongly recommend these pieces from Historical Materialism:
https://booksandjournals.brillonline.com/content/journals/10.1163/1569206x-12341548
(See also:
https://johnriddell.wordpress.com/2018/02/01/rosa-luxemburgs-bloc-with-the-spd-bureaucracy/
https://johnriddell.wordpress.com/2018/02/13/rosa-luxemburg-and-the-revolutionary-party-revisited/
https://brill.com/view/journals/hima/25/4/article-p37_37.xml
https://brill.com/view/journals/hima/24/1/article-p135_7.xml