Y. Systra

SURFACE MINING TECHNOLOGY IN THE ZONES OF TECTONIC DISTURBANCES, ESTONIAN OIL SHALE DEPOSIT

Juri-Rivaldo Pastarus, Y. Systra, Ingo Valgma, 2013 .

Possibilities of oil shale mining under the Selisoo mire of the Estonia oil shale deposit

Juri-Rivaldo Pastarus, Y. Systra, M. Orru, 2013, Environmental Earth Sciences.

Dependence of Estonian Peat Deposit Properties on Landscape Types and Feeding Conditions. Eesti turba omaduste sõltuvus maastikutüüpidest ja turbalasundi toitumistingimustest

H. Orru, Y. Systra, 2010 .

Trace fossils from the Dividalen Group of northern Finland with remarks on early Cambrian trace fossil provincialism

Y. Systra, S. Jensen, 2006 .