Csiszár Imre: Information theory. Coding theorems for discrete memoryless systems - Disquisitiones mathematicae Hungaricae 12. (Budapest, 1981)
DISQUISITIONES MATHEMATICAE HUNGARICAE \ A COMMISSIONE MATHEMATICORUM HUNGARORUM REDACTAE IN AEDIBUS ACADEMIAE SCIENTIARUM HUNGARICAE BUDAPESTINI MCMLXXXI