I really enjoyed physicist Michael Nielsen's "Using spaced repetition systems to see through a piece of mathematics," as the post lets the reader learn about the thought process behind a researcher who is highly accomplished in a mathematics-heavy field, in both academia and industry (2019):
https://cognitivemedium.com/srs-mathematicsI plan to re-read the post as I gain a better understanding of higher-level mathematics over time, but from my first reads, I could relate and better put to words the idea that using spaced repetition to study technical concepts (though I personally always make sure it's not the main method of study, versus practice exercises) can help you better grasp connections between concepts over time.
A statement from the author's article that I still think about from time to time is: "I can’t emphasize enough the value of finding multiple different ways of thinking about the “same” mathematical ideas."
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From a completely different angle, Nicky Case's "How to remember anything forever-ish" is a fun introductory post for giving an overview of what spaced repetition is, in case a friend or colleague is curious about the study method (2018): https://ncase.me/remember/
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For a much older article that contains the fundamentals of making good elements/items/flashcards, Piotr Wozniak's "20 rules of knowledge formulation" is an article that I've referred to time and time again. I treat the rules more as guidelines, as I personally don't use images or cloze deletion, but I've improved my retention and understanding of topics by avoiding questions that ask for lists, and by always trying to understand a topic before making a flashcard about the subject (though this can be flexible to a certain extent, depending on the subject): https://supermemo.guru/wiki/20_rules_of_knowledge_formulatio...
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As a last one that focuses more on the technical aspects of using the SuperMemo article specifically, I applied the information from this article published in 2010 to create a special Google Sheet to make it easier to import spreadsheets into SuperMemo: https://thesupermemoblog.wordpress.com/2010/05/15/exporting-...
Specifically, to import dozens of vocabulary flashcards at once, I open a spreadsheet file (aka workbook) and begin with a main spreadsheet with the English in column A and the translation in column B. A second spreadsheet then contains a copy of the first spreadsheet's information, but appending "Q: " to the column A entries and "A: " to the column B entries.
I then export this as a .csv file, replace the extension to .txt, and then use Vim (though Sublime Text or another text editor equally works well), to replace each instance of `,A` (that is, each instance of a comma that separates each item) with `\rA` (that is, a line break), to fit the import formatting required by SuperMemo.
This process helps a lot for picking up new phrases from newspaper articles and storing them in my records, and then importing them into my spaced repetition software for review without too much typing. I would guess that Anki's import method is easier and more straightforward, but I still do prefer SuperMemo despite the complexity (and lack of mobile access for the version I use), as I prefer the item scheduling. My impression is that in the long run, I have fewer reviews with the same amount of retention, which anecdotally seems to be true so far.