- Rick Procter’s obituary on APL Borealis site.
- Morten Kromberg’s blog post.
- Dan’s Vector posts.
- Dan’s YouTube videos teaching APL (as APLTrainer).
- Dan’s Facebook page (open to anyone with a Facebook account).
- Dan’s APLSmith site.
- Adám’s code-golf in memory of Dan, celebrating Dan’s most famous APL idiom.
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