Chennai, Aug 9 - The mantra to success is hard work mixed with smartness and intelligence, says Tamil superstar Rajnikant.

Speaking Sunday at the audio release of 'Eeram', produced by Shankar's 'S' Pictures and directed by newcomer Arivazagan, Rajnikant said: 'Shankar is an example of hard work, coupled with smartness and efficiency.'

Rajnikant, after the success of 'Sivaji - The Boss', has teamed up with Shankar for 'Endhiran', which also stars Bollywood actress Aishwarya Rai.

'Eighty-five percent shooting of 'Endhiran' is complete. Working with Shankar in 'Sivaji - The Boss' as well as 'Endhiran' was a delight. I have discovered a close friend in him,' said the actor.

'Eeram', which has music by S. Thaman, features Adhi, Nandha and Sindhu Menon in the lead roles.