Why Is There a Trefoil Motif From Karja Church in Pikk Street in Tallinn? : Based on the Example of the Restoration of the In-Situ Gothic Portal in Pikk Street 7, How Medieval Is the Medieval Architecture of Tallinn Old Town? - Paju, Risto (. Baltic journal of art history. - Tartu : Univ. of Tartu Press, 2009-. - ISSN 1736-8812 23, 2022)