[On the problem of the economic significance of enzootic pneumonia of swine].
D000818:Animals; D005525:Food-Processing Industry; D011014:Pneumonia / Q000662:veterinary*; D013552:Swine; D013553:Swine Diseases / Q000517:prevention & control*
Zur Frage der wirtschaftlichen Bedeutung der enzootischen Pneumonie der Schweine.