To all William (Bill) Alexander fans: Some days I discovered that just a few weeks ago a new biography of Bill has been released.
It is available in English language as well as in German, here is a link to the English one: https://www.amazon.com/Forgotten-Artist-William-Bill-Alexander/dp/3758327202
I found it really interesting as it mentioned a lot of facts which I did not know yet, even I read an other, different biography of him from the 1980s.
I thought it might interest a few people here too.