Detection and Quantification of Major Phytochemical Markers for Standardization of Talinum Portulacifolium, Gomphrena Serrata, Alternanthera Sessilis and Euphorbia Heterophylla by HPLC, Vani, Mamillapalli, Rahaman Shaik Abdul, and Rani Avula Prameela , Pharmacognosy Journal, March 2018, Volume 10, Issue 3, p.439-446, (2018)