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Alexander Schmemann has written:
'Great Lent'
'For the life of the world' -- subject(s): Orthodox Eastern Church
'World as Sacrament'
'Introduction to liturgical theology' -- subject(s): Doctrines, Liturgics, Liturgy, Orthodox Eastern Church
January 20 (catholic) December 18 (Eastern Orthodox)
They are called Eastern Orthodox Christians or just Orthodox Christians.
Eastern Orthodox is a branch of Christianity.
June 5; December 19 (Eastern Orthodox church)