KERTYS, Martin - URBANOVÁ, Anna - MOKRÝ, Juraj. Quantification of theophylline in guinea pig plasma by LC-MS/MS using hydrophilic interaction liquid chromatography stationary phase: method development, validation, and application in study. In Acta medica Martiniana. ISSN 1335-8421. Martin : Jesseniova lekárska fakulta Univerzity Komenského v Martine, 2017, 2017, roč. 17, č. 3, s. 5-15.