1           1978-01-04.12  Haupt (1980) 
 2           1978-01-05.04  Haupt (1980) 
 3           1978-01-07.06  Haupt (1980) 
 4           1987-03-04.25  Magnusson & Lagerkvist (1991) 
 5           1987-03-05.22  Magnusson & Lagerkvist (1991) 
 6           1987-03-06.16  Magnusson & Lagerkvist (1991) 
 7           1991-02-17.22  Lagerkvist et al. (1992) 
 8           1991-02-18.21  Lagerkvist et al. (1992) 
 9           1991-02-19.20  Lagerkvist et al. (1992) 
10  1997-10-19--2011-03-04  Lowell