Phytochemical Evaluation and Chromatographic Fingerprint Analysis on Flavonoids Compounds in Leucas aspera (Willd.) Link Leaf by HPTLC, Annapandian, Vellaichamy Muthupandi, Sundaram Rajagopal Shanmuga, and Gomathi Swaminathan , Pharmacognosy Journal, September 2017, Volume 9, Issue 6, p.942-946, (2017)