Ziziphus mauritiana mediated synthesis of copper and nickel nanoparticles for comparative efficacy in biological water purification oleh Rabia Naveed, Raziya Nadeem, Muhammad Asghar, Sajjad Rahman, Ahsan Naveed, Shaukat Ali, Tahira Iqbal, Rohama Gill, Tariq Ansar, Shazia Anjum, Rashid Saeed