Letter: The possible relationship of selenium and superphosphate to the frequency of intestinal carcinomas in sheep.
D000818:Animals; D005308:Fertilizers; D005459:Fluorides; D007414:Intestinal Neoplasms / Q000209:etiology / Q000662:veterinary*; D010710:Phosphates; D012643:Selenium / Q000009:adverse effects*; D012756:Sheep; D012757:Sheep Diseases / Q000139:chemically induced / Q000209:etiology*
D005308:Fertilizers; D010710:Phosphates; D012643:Selenium; D005459:Fluorides