Damadoran is the biggest guru in Corporate finance. Watch the video from about 14 minute. He talks on valuation, Tesla and Valeant. Well spent 8 miuntes.
http://www.valuewalk.com/2016/04/aswath-damodaran-valeant-accounting-valuation/
Also recommended:
http://aswathdamodaran.blogspot.cz/
Fit Investment Ideas 