When were 'Permutation codes' and 'Programming Language Constructs for Which it is Impossible to Obtain \Good\ Hoare-Like Axiom Systems' published?
Mention the years in which 'Permutation codes' and 'Programming Language Constructs for Which it is Impossible to Obtain \Good\ Hoare-Like Axiom Systems' were published.
SELECT DISTINCT ?answer WHERE { { <https://dblp.org/rec/journals/ejc/Cameron10> <https://dblp.org/rdf/schema#yearOfPublication> ?answer } UNION { <https://dblp.org/rec/conf/popl/Clarke77> <https://dblp.org/rdf/schema#yearOfPublication> ?answer } }
<https://dblp.org/rec/journals/ejc/Cameron10> <https://dblp.org/rec/conf/popl/Clarke77>