Khagesh Kumar Singh, and Ashtosh Kumar. 2013. “Study of Simple and Mixed Ligand Complexes of Glycyl Glycine With Cu (II), Ni (II), Co (II) and Zn (II)”. Journal of International Academy of Physical Sciences 17 (3):309-15. https://www.iaps.org.in/journal/index.php/journaliaps/article/view/558.