The thermophysical properties and the stability of nanofluids containing carboxyl-functionalized graphene nano-platelets and multi-walled carbon nanotubes by Karami, Hadi, Papari-Zare, Solmaz, Shanbedi, Mehdi, Eshghi, Hossein, Dashtbozorg, Amirhosein, Akbari, Amir, Mohammadian, Erfan, Heidari, Milad, Sahin, Ahmet Z., Chew, Bee Teng