Barnum (2003) references the following paper by Ruttiman 1. , inverted commas, " "
I have attached the barnum paper as well. Does anyone know whether the Ruttimann paper below;references was ever published or if the material is another newer article by ruttimann?Likewise with regard to the other ruttiman paper mentioned in the references of the barnum article.
"1. Ruttiman, G. (1993). Selected topics in the convexity theory of quantum logics. Preprint, cited inBeltrametti and Bugajski (1993)."