Rao, N. Kameswara Bulletin of the Astronomical Society of India, 33, 4, desembre 2005, pàg. 499–511. Bibcode: 2005BASI...33..499R [Consulta: 11 maig 2007]. «It appears that two artifacts from Mohenjo-daro and Harappa might correspond to these two instruments. Joshi and Parpola (1987) lists a few pots tapered at the bottom and having a hole on the side from the excavations at Mohenjadaro (Figure 3). A pot with a small hole to drain the water is very similar to clepsydras described by Ohashi to measure the time (similar to the utensil used over the lingum in Shiva temple for abhishekam).»
Vallicrosa, Josep. Assaig d'història de les idees físiques i matemàtiques a la Catalunya medieval. Barcelona: Edicions Científiques Catalanes, 1983. ISBN 84-86257-00-X. OCLC802585254.