nummerdatud annetena, kuid normimata ajavahemike järel ja määramata annete arvuga ilmuv väljaanne, publication in print or in non-print-form,issued in successive parts,usually having numerical or chronological destinations,and intended to be continued in definitely,whatever the periodicity, a publication in any medium issued under the same title in a succession of discrete parts, usually numbered (or dated) and appearing at regular or irregular intervals with no predetermined conclusion, a work issued as a supplement to one previously published or a part issued in continuance of a monographic set or series