A while ago I wanted to refer to my old answer, but I've realised the question was most probably removed by an OP. That is not a first time I can see user posting a question and removing it from SE after receiving an answer. I believe this is highly unacceptable as the knowledge should be common for everyone. Not mentioning even effort of person answering to a given question (in my case I've spend over one hour).
See this answer:
When can't I delete my own post?
You can't delete answers that have been accepted.
You can't delete any question that:
- has an upvoted answer, or
- has multiple answers (even if there are no upvotes)
You can't delete any of your questions or answers if you haven't registered your account (that is, associated an OpenID with it).