Banco de Portugal publishes "O Boletim Notas e Moedas" (the Banknotes and Coins Bulletin) every April and October on cash-related matters, and distributes it electronically, free of charge.
It comes in five parts (the Euro, Counterfeiting, Euro Banknotes and coins, Banknotes and coins of the world and Sundry information) and is aimed at professional cash handlers (banks and cash-in-transit companies) and other interested entities (retailers, police, collectors, etc.).