Chyba najprościej obecnie – profil
www.academia.edu: https://jagiellonian.academia.edu/AndrzejBetlej
Google Scholar: https://scholar.google.pl/citations?hl=pl&user=GCiaUawAAAAJ
ResearchGate: https://www.researchgate.net/profile/Andrzej_Betlej/publications?sorting=recentlyAdded