Arifullah, E., Zaim, Y., Aswan and Djuhaeni (2021) “Basin-scale Paleoecology: Using Semi-quantitative Analysis of the Ichnofabric within Kutai Basin (Indonesia)”, Journal of Mathematical and Fundamental Sciences, 53(2), pp. 286-305. doi: 10.5614/j.math.fund.sci.2021.53.2.8.