Volume 7 (2021) Serbian Journal of Geosciences Volume 7 (2021)Some key technology trends in tourism industryBrankica Pažun, Zlatko LangovićHysteresis effect in suspended sediment concentration in Kutinska River basinMilena Gocić, Ljiljana Stričević, Nataša Martić BursaćWater Quality of the Middle and Lower Course of the Ibar River in two testing seasonSaša Obradović