Pai, S., A. Jindal, and B. Bhattachan. “A Randomized, Double-Blinded Study of Comparison of 2.5 mg/L Versus 3.75 mg/L of Methoxsalen Concentration for Bath-PUVA in Psoriasis Vulgaris”. Journal of Pakistan Association of Dermatologists, vol. 29, no. 3, Oct. 2019, pp. 294-01, https://www.jpad.com.pk/index.php/jpad/article/view/1339.