Sahashi, Y. ., and Y. . Hikasa. “Therapeutic Effects of Sildenafil Combined With Low-Dosage Imatinib on Pulmonary Hypertension in Five Dogs”. The Thai Journal of Veterinary Medicine, vol. 52, no. 3, Sept. 2022, pp. 633-8, https://he01.tci-thaijo.org/index.php/tjvm/article/view/258671.