Hi Marco--

I found the publication you are seeking with a little detective work on the internet. One tip is: use full words, not abbreviations, when searching for publications. I'll give you one hint and then leave you to search for yourself: Brookhaven Symposia in Biology. Good luck and report back. :)

Hi Marco, unlike Angela, I have had no luck, but I am outside the US with a University library that has less resources than US Universities tend to have. I agree with her that you should avoid abbreviations, but I also remember back in the pre-internet days, many journals/publications being abbreviated, and needing to check with a librarian to help decipher them. From what I can tell, that this is an old conference proceeding. If your experience follows mine, you will go to a lot of work to get the publication (you may need to go to your library and do an inter-library loan if you can't find a copy online anywhere), only to get an abstract of a talk he gave. Hopefully that's not the case here. But while you're sleuthing out this article or waiting for the loan to come through, I Do get some of Hadorn's other papers. I feel like I saw some as I was looking for the one you want, perhaps even from 1966, so could be the formal publication of the study referenced in the proceedings. If you are having trouble, do go to your librarian- this is their job helping you find references! Best of luck!

https://catalog.hathitrust.org/Record/000546391

If you get it, give a thanks to Angela.

Thank you, Angela! I usually avoid using abbreviations when searching for articles... but in this case I couldn't realise it was "Brookhaven Symposia in Biology". I have found Dr. Hadorn's publication. Thank you again, to all of you who have helped me!

Hooray, Marco! Glad to help. Good luck with your research. My best--Angela