A HPTLC densitometric determination of flavonoids from Passiflora alata, P. edulis, P. incarnata and P. caerulea and comparison with HPLC method - Pereira, Cíntia Alessandra Matiucci; Yariwake, Janete Harumi; Lanças, Fernando Mauro; Wauters, Jean-Noël; Tits, Monique; Angenot, Luc (Phytochemical Analysis, 2004)