Sinchaisri P. Study on Pyrethrin Content in Pyrethrum Flower Head at Different Stages of Development . Thai Agric.Res.J. [internet]. 1983 Jan. 1 [cited 2026 Oct. 2];1(1):31-4. available from: https://li01.tci-thaijo.org/index.php/thaiagriculturalresearch/article/view/245705