Extremal rational elliptic threefolds

Arthur Prendergast-Smith
2010 The Michigan mathematical journal  
535 1. E 7 : Here we are adding just one node. The only possible outcome isẼ 7 . 2. A 7 : Adding one node, we can get eitherà 7 orẼ 7 .
doi:10.1307/mmj/1291213956 fatcat:rlclcpbbpreu7kkbedqk4wg2ia