Smola, Serhii, et al. “PECULIARITIES OF STRUCTURE AND SPECTRAL-LUMINESCENT PROPERTIES OF CARBOXYMETHOXY-SUBSTITUTED CALIX[4]ARENES AND THEIR COMPLEXES WITH LANTHANIDES”. Ukrainian Chemistry Journal, vol. 86, no. 3, Apr. 2020, pp. 9-18, doi:10.33609/0041-6045.86.3.2020.9-18.