Mandrali Eleni; Rahonis George: Weighted first-order logics over semirings. In: Acta cybernetica, (22) 2. pp. 435-483. (2015)
Mandrali Eleni; Rahonis George: Recognizable tree series with discounting. In: Acta cybernetica, (19) 2. pp. 411-439. (2009)