The Journal of the Numismatic Society of India. 22-23. Numismatic Society of India. 1960. p. 279. «But this attribution presents some difficulties because Mewar, in those days, had altogether a different currency and the Guhila rulers of Mewar never adopted the device of cow suckling a calf on the reverse of their coins. Still more, they never issued gold coins because Mewar was not a very big empire during that period. Therefore, it is not plausible to identify Voppa or Vopparaja of these gold coins with Bappa Rawal of Mewar or any other ruler of the neighbouring region.»
