Seems to have a reasonably prolific history of academic publications, but suddenly ceased in 1995: <a href="http:&#x2F;&#x2F;dblp.uni-trier.de&#x2F;pers&#x2F;hd&#x2F;m&#x2F;Mercer:Robert_L=" rel="nofollow">http:&#x2F;&#x2F;dblp.uni-trier.de&#x2F;pers&#x2F;hd&#x2F;m&#x2F;Mercer:Robert_L=</a>