The subscription is extended for a further year if it has not been cancelled three months before the end of the subscription period. If the journal cannot be delivered for any reason beyond the control of the publisher, no claims will be accepted for subsequent delivery or repayment of the subscription. This journal is published six times per year. Such articles which have either been submitted or appeared elsewhere will not be accepted fo publication.
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The editorial staff reserves the right to revise manuscripts. Authors whose names are listed and who are not members of the editorial staff, are personally responsible for the contents of any articles published. Neither editors nor the publisher may be held responsible for these contributions.