| Name | Info | Provider | Link |
|---|---|---|---|
| subscription/membership/fee required | Ovid Technologies, Inc. | http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=10233602.ui | |
| subscription/membership/fee required | Wiley | https://onlinelibrary.wiley.com/resolve/openurl?genre=article&sid=nlm:pubmed&issn=0307-6938&date=1998&volume=23&issue=5&spage=208 | |
| subscription/membership/fee required | Silverchair Information Systems | https://academic.oup.com/ced/article-lookup/doi/10.1046/j.1365-2230.1998.00372.x |