Letters in Mathematical Physics
Letters in Mathematical Physics > 2014 > 104 > 6 > 731-747
Letters in Mathematical Physics > 2014 > 104 > 6 > 691-705
Letters in Mathematical Physics > 2014 > 104 > 6 > 749-770
Letters in Mathematical Physics > 2014 > 104 > 6 > 673-690
Letters in Mathematical Physics > 2014 > 104 > 6 > 707-729
Letters in Mathematical Physics > 2014 > 104 > 6 > 635-671