https://hmr.biomedcentral.com/articles/10.1007/BF02189590
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https://hmr.biomedcentral.com/articles/10.1007/BF02189591
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https://hmr.biomedcentral.com/articles/10.1007/BF02189587
https://hmr.biomedcentral.com/articles/10.1007/BF02189586
https://hmr.biomedcentral.com/articles/10.1007/BF02189592
https://hmr.biomedcentral.com/articles/10.1007/BF02189589
https://hmr.biomedcentral.com/articles/10.1007/BF02189593