Associative Shuffle of Infinite Words. - Alexandru Mateescu; George Daniel Mateescu (Structures in Logic and Computer Science, 1997)

Shuffle-like Operations on omega-words. - Alexandru Mateescu; George Daniel Mateescu; Grzegorz Rozenberg; Arto Salomaa (New Trends in Formal Languages, 1997)

Infinite trajectories. - Alexandru Mateescu; George Daniel Mateescu (Developments in Language Theory, 1997)

Associative closure and periodicity of $ omega $-words. - Alexandru Mateescu; George Daniel Mateescu (RAIRO Theor. Informatics Appl., 1998)

Fair and Associative Infinite Trajectories. - Alexandru Mateescu; George Daniel Mateescu (Jewels are Forever, 1999)