Paál, A [[Possibilities of the medico-biological use of air ionization in the 18th and 19th centuries and their current usefulness]. [electronic resource] - Orvosi hetilap Mar 1984 - 595-6, 599 p. digital Publication Type: Historical Article; Journal Article ISSN: 0030-6002 Subjects--Topical Terms: Air IonizationEuropeHistory, 18th CenturyHistory, 19th CenturyHungaryPhysics--historyPhysiology--history