1           1975-10-01.89  Scaltriti & Zappala (1978) 
 2           1975-10-02.90  Scaltriti & Zappala (1978) 
 3           1978-07-25.36  Harris & Young (1980) 
 4           1978-07-27.38  Harris & Young (1980) 
 5           1978-07-28.40  Harris & Young (1980) 
 6           1978-07-29.36  Harris & Young (1980) 
 7           1978-07-31.38  Harris & Young (1980) 
 8           1985-11-20.08  Lagerkvist et al. (1995) 
 9           1987-02-28.19  Magnusson & Lagerkvist (1991) 
10           1987-03-01.26  Magnusson & Lagerkvist (1991) 
11           1987-03-04.26  Magnusson & Lagerkvist (1991) 
12           1987-03-05.23  Magnusson & Lagerkvist (1991) 
13  1998-09-18--2012-04-01  Lowell