Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:[6] and Albal et al. [9, lo] found no influence of the pressure on the volumetric liquid-phase mass transfer coefficient and on the interfacial area, while Sridhar and Potter [ 11, 121 report an increase in the interfacial area of as much as 75% for a pressure increase from 0.1 to 1.1 MPa. The contradictory results of the above-mentioned authors can lead to considerable miscalculations, whatever correlation is taken. In this paper all major studies on the influence of pressure on mass transfer phenomena in gas-liquid systems and reactors are reviewed critically. Points of agreement and conflict are indicated and discussed in order to improve understanding of the mass transfer 0255-2701/89/%3.50 Chem. Eng. Process., 25 (1989) M-98 0 Elsevier Sequoia/Printed in The Netherlands
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