Evolving software product lines with aspects: an empirical study on design stability. - Eduardo Figueiredo 001; Nélio Cacho; Cláudio Sant'Anna; Mario Monteiro; Uirá Kulesza; Alessandro Garcia 001; Sérgio Soares; Fabiano Cutigi Ferrari; Safoora Shakil Khan; Fernando Castor Filho; Francisco Dantas (ICSE, 2008)