Hello @Chapi and welcome to the SAS Support Communities!
Whenever you need a paper from one of the major US or international SAS conferences, https://www.lexjansen.com is probably the most comprehensive source you can find. The link to the paper in question on that website is https://www.lexjansen.com/nesug/nesug07/sa/sa13.pdf.
In any case, whether the analytical version (i.e. formula) for CI exists or not, you can obtain the CI by bootstrap.
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ANOVA, or Analysis Of Variance, is used to compare the averages or means of two or more populations to better understand how they differ. Watch this tutorial for more.
Find more tutorials on the SAS Users YouTube channel.