Efficient solvent-free microwave-assisted esterification of fusel oil using p-TsOH and 'H IND.3'P'W IND.12''O IND.40' as catalysts - Pérez, Eduardo R.; Carnevalli, Nélly C.; Cordeiro, Paulo Jorge Marques; Rodrigues Filho, Ubirajara Pereira; Franco, Douglas Wagner (Organic Preparations and Procedures International, 2001)