The notation Old Style or (OS) is sometimes used to indicate a date in the Julian Calendar (which is used by churches on the "Old Calendar"). The notation New Style or (NS), indicates a date in the Revised Julian calendar (which is used by churches on the "New Calendar").
The only evidence for the life of Saint Crescentiana is a church in Rome dedicated to her that was already extant at the time of Pope Symmachus (498-514) (Benedictines).[14]
St Barlaam and his holy icon are venerated in Ukraine by those afflicted with the inclination to drinking; their friends and relatives also invoke his intercession on their behalf.[18]
Blair, John (2002). "A Handlist of Anglo-Saxon Saints". In Thacker, Aland and Sharpe, Richard. Local Saints and Local Churches in the Early Medieval West. Oxford, UK: Oxford University Press. p.512.
(in Greek) Συναξαριστής. 5 Μαΐου. ECCLESIA.GR. (H ΕΚΚΛΗΣΙΑ ΤΗΣ ΕΛΛΑΔΟΣ).
Russian Sources
(in Russian)18 мая (5 мая). Православная Энциклопедия под редакцией Патриарха Московского и всея Руси Кирилла (электронная версия). (Orthodox Encyclopedia - Pravenc.ru).