Prabawati, S. Y.; Jumina, J.; Santosa, S. J.; Mustofa, M. The Utilization of Poly-37,40-Diallyl-38,39,41,42,-tetrahydroxycalix[6]arenes Compound As Adsorbent for Heavy Metal Cations Cd(II), Cr(III) and Cu(II). JKR 2020, 5, 94-99.