Citing from the Shaiva Upanishads right from 13th Century CE onward

Citing from the Shaiva Upanishads right from 13th Century CE onwards

This FB article in Tamil gives details about several Shaiva Upanishads cited as early as 13 Century CE by Shaiva Acharyas in their works: 

Brihajjabla Up, Shivasankalpa Up, Kalagni Rudra, Pancha Brahmopani, Rudraksha Jabala Up, .Panchakshara Jabala up. 
He wrote this article in refutation of a bigoted Vaishnava’s bizarre claim that ‘It was Appayya Dikshitar and his henchmen who concocted these upanishads and fabricated a 108 Upanishad document’   He had claimed ‘none of these so-called Shaiva upanishads have been cited by anyone before the last 600 years…’

Om Tat Sat