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Thompson AE, Pope JE (February 2005). "Calcium channel blockers for primary Raynaud's phenomenon: a meta-analysis". Rheumatology. 44 (2): 145–50. doi:10.1093/rheumatology/keh390. PMID15546967.
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"Nifedipine". The American Society of Health-System Pharmacists. Diarsipkan dari versi asli tanggal 2018-08-08. Diakses tanggal Sep 17, 2019.Parameter |url-status= yang tidak diketahui akan diabaikan (bantuan)
Ali, Mir Omar & Qazi, Samia (2007-09-19). "Pulmonary Edema, High-Altitude". eMedicine. Diarsipkan dari versi asli tanggal 2007-11-16. Diakses tanggal 2007-11-25.Parameter |url-status= yang tidak diketahui akan diabaikan (bantuan)