Flexible Alias Protection. James Noble, Jan Vitek, John Potter. ECOOP 1998.
Award committee: Davide Ancona (chair, AITO exec member), Todd Millstein (PC chair of ECOOP 2018), Oscar Nierstrasz (PC member of ECOOP 1998)
Motivations: The paper has been the start of a flurry of work on ownership types, which is still influential in the academic community and had practical impact on the design of the programming language Rust.
Link to the paper.