1           1988-11-08.35  Di Martino et al. (1990) 
 2           1994-02-06.07  Lagerkvist et al. (1995) 
 3           1994-02-10.06  Lagerkvist et al. (1995) 
 4           1994-02-18.11  Lagerkvist et al. (1995) 
 5           1994-02-19.19  Lagerkvist et al. (1995) 
 6           1994-03-06.02  Lagerkvist et al. (1995) 
 7           2007-03-26.85  
 8           2009-08-14.99  
 9           2009-09-22.84  
10           2010-12-10.09  
11           2010-12-11.05  
12           2011-01-29.00  
13           2011-02-07.01  
14           2011-02-09.94  
15           2011-03-05.88  
16           2011-04-07.85  
17  1998-02-24--2012-04-15  Lowell