To achieve this we will need to amend the style instructions that are applied to the author names. As we’re using IEEE as a basis, we can open this style for editing. By default the CSL Editor will add your name to the end of the existing style name to create a new style - the editor will always prevent you from overwriting the IEEE style, which you may need in the future.
With your new style open, the first step is to identify the component you intend to amend. In this instance, we know that we want to amend the author names - which are prominently visible in the Example Panel. Simply click on the author names from the first example citation. You should note that the active element in the Style Overview panel updates to reflect that the Names attribute is now the active element - the relevant element (in this case Bibliography > Layout > Author (macro) > Names ) will have expanded and been highlighted. You’ll also note that the Info Panel changes to reflect the options available to apply to this element.
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3. From the example citations that are provided, we can see that 'et al' is already being used for in-line citations. Assuming we want to modify this behaviour, we need to modify the settings associated with In-line citations. Click on the 'In-line Citations' heading in the Style Overview panel to display the settings for this item.
4. With In-line citations selected, we can see a number of settings that control the use of 'et al'. In this instance, the relevant fields are 'et-al-min' (set to 6), et-al-use-first (set to 1), et-al-subsequent-min (set to 3) and et-al-subsequent-use-first (set to 1).
In lay terms, this can be read as follows:
If a reference has five or fewer authors, display all the author names in the citation. If a reference has six or more authors, display the first name followed by 'et al' in the citation.
If a reference has three or more authors, display all three authors in the first citation, but for any subsequent citations use the first name, followed by 'et al'.
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