Ferenc Rudolf; Gustafsson Juha; Müller László; Paakki Jukka: Recognizing design patterns in C++ programs with the integration of Columbus and Maisa. In: Acta cybernetica, (15) 4. pp. 669-682. (2002)
Paakki Jukka; Toppola Kari: An error-recovering form of DCGs. In: Acta cybernetica, (9) 3. pp. 211-221. (1990)