A. S. . Hasdam, H. Hasim, A. . Sulaeman, M. H. . Machfoed, and M. . Santoso, “The Influence of Heavy Metal Levels on Autism Case in Bontang and Samarinda City, East Kalimantan – Indonesia”, IJSBAR, vol. 48, no. 3, pp. 122–142, Sep. 2019.