control. Since 1998, it has been available in an electronic edition, alongside its regular print edition. The electronic edition was available without charge, as an open access journal, but since 2008, this is no longer the case. Issues from before 2003 were transferred to the non-free JSTOR archive, and articles are not freely available until 5 years after publication.

Abstracting and indexing

The journal is abstracted and indexed in the Science Citation Index,

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