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Each paper (including short communications) must start with a brief abstract summarizing the main results and conclusions of the work, and such other information as to make it suitable for publication without change in abstracting journals. References. References should be kept to an essential minimum and must be listed alphabetically at the end of the paper. Titles of journals are given in full and references to books should include the place of publication and publisher.doi:10.1017/s0025315400041497 fatcat:u5li4svae5hujlgkkainckpmxi