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Table representation of search results timeline featuring number of search results per year.

Year Number of Results
1998 3
1999 1
2004 1
2006 1
2007 1
2008 1
2009 1
2011 1
2014 1
2021 0
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Page 1
Seismic evidence for an inner core transition zone.
Song X, Helmberger DV. Song X, et al. Among authors: helmberger dv. Science. 1998 Oct 30;282(5390):924-7. doi: 10.1126/science.282.5390.924. Science. 1998. PMID: 9794758 Free article.