61
62
63
64
Fresenius' journal of analytical chemistry, 367 (2000) S. 407 - 413
65
66
Atomic spectroscopy, 21 (2000) S. 149 - 155
67
68
69
70
71
Fresenius' journal of analytical chemistry, 368 (2000) S. 23 - 30
72
73
74
75
76
77
78
79
80