[Effect of negatively and positively charged air ions on the resistance of calves].
D000390:Air Ionization; D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000517:prevention & control*
Vliianie otritsatel'no i polozhitel'no zariazhennykh aeŕoinov na rezistentnost' organizme teliat.