_:nb21d50fe57b9419a96460f5d9b423c02xb4
<http://schema.org/item>
"https://aaai.org/proceeding/book-one-proceedings-of-the-fourth-international-conference-on-artificial-intelligence-planning-systems/"
<https://aaai.org/papers/00044-aips98-006-conditional-effects-in-graphplan/>