Final answer:
The study conducted by Celio, Durlak & Dymnicki in 2011 cannot be identified from the given references, and additional context is necessary to provide an accurate response.
Step-by-step explanation:
The study conducted by Celio, Durlak & Dymnicki in 2011 is not discernible from the information provided. To provide a proper answer, additional context about this specific study is required. Relevant information, such as the study's title, journal publication, or main focus, would enable a response that addresses the student's inquiry comprehensively. As the provided references do not include a study authored by Celio, Durlak & Dymnicki in 2011, it is not possible to define the study without further information.