Niemelä, S. (1985). Duodenogastric reflux in patients with upper abdominal complaints or gastric ulcer: With particular reference to reflux-associated gastritis. Universitetsforlaget.
Citace podle Chicago (17th ed.)Niemelä, Seppo. Duodenogastric Reflux in Patients with Upper Abdominal Complaints or Gastric Ulcer: With Particular Reference to Reflux-associated Gastritis. Oslo: Universitetsforlaget, 1985.
Citace podle MLA (8th ed.)Niemelä, Seppo. Duodenogastric Reflux in Patients with Upper Abdominal Complaints or Gastric Ulcer: With Particular Reference to Reflux-associated Gastritis. Universitetsforlaget, 1985.
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