Ethyl esters (biodiesel) production by Pseudomonas fluorescens lipase immobilized on chitosan with magnetic properties in a bioreactor assisted by electromagnetic field - Cubides-Roman, Diana C.; Pérez, Victor Haber; Castro, Heizir F.de; Orrego, Carlos E.; Giraldo, Oscar H.; Silveira, Euripedes Garcia; David, Geraldo F. (Fuel, 2017)