<r>Hello everyone! I'm a student and I'm writing my master thesis on the subject of negative rates, and I would like to implement the mixed SABR (Antonov et al 2015 - <URL url="http://papers.ssrn.com/sol3/papers.cfm?abstract_id=2653682"><LINK_TEXT text="http://papers.ssrn.com/sol3/papers.cfm? ... id...