Rai, H.C., Sushma Sinha, and B.K. Rai. 2010. “Fluoroboro Bridged Cyclopean-Type Macrocyclic Co(II), Ni(II) and Cu(II) Complexes”. Asian Journal of Chemistry 12 (3):922-24. https://asianpubs.org/index.php/ajchem/article/view/23093.