Can some one give me a reference/proof of the fact that the genus of the ternary form X^2+2Y^2+2YZ+5Z^2 consists of one class?

In Bhargava's paper "The fifteen theorem", it is mentioned and used that the genus of the ternary form X^2+2Y^2+2YZ+5Z^2 , consists of a single class. Can some one give me a reference/proof of...

29 April 2015 7,267 3 View