1. IZIIS, RZZSK, GCI, joint research project [ 1991-1994 ] “ Seismic Strengthening, ConservationRestoration of Churches Dating from the Byzantine Period (9th- 14th Century) in Macedonia ” First phase of investigations Vol 1-6, Reports IZIIS 500-76-91/(1-6); Second phase of investigations Vol 7-10, Reports IZIIS 92-71/(7-10); Third phase of investigations Vol. 11 and 12, Reports IZIIS 94-68/(1,2) .