Evolving the System's Core: A Case Study on the Identification and Characterization of Key Developers in Apache Ant. - Gustavo Ansaldi Oliva; José Teodoro da Silva; Marco Aurélio Gerosa; Francisco Werther Silva Santana; Cláudia Maria Lima Werner; Cleidson Ronald Botelho de Souza; Kleverton Carlos Macedo de Oliveira (Comput. Informatics, 2015)