Perimenis P (2005). “Sildenafil for the treatment of altitude-induced hypoxaemia”. 《Expert Opin Pharmacother》 6 (5): 835–7. doi:10.1517/14656566.6.5.835. PMID15934909.
Perimenis P (2005). “Sildenafil for the treatment of altitude-induced hypoxaemia”. 《Expert Opin Pharmacother》 6 (5): 835–7. doi:10.1517/14656566.6.5.835. PMID15934909.