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RŌHANA, Research Journal of the University of Ruhuna published
.

annually by the University of Ruhuna, Sri Lanka

Editorial Board

Editor–in–Chief: Snr. Prof. WTS Dammini Premachandra

Editorial board: Snr. Prof. KKU Aruna Kumara
Snr. Prof. Jayantha Amarasinghe
Prof. KHM Ashoka Deepananda
Prof. SA Buddhika
Prof. (Mrs.) GHMJ Subashi De Silva
Dr. AS Dissanayake
Dr. JA Jeewanie
Dr. (Ms.) VHP Vitharana
Dr. Janaka Ruben
Mr. UA Lal Pannila
Mr. N Hettiarachchi

The present Editorial board greatly appreciates the contribution of previous Editorial
board members, Snr. Prof. P Hewage, Snr. Prof. LP Jayatissa, Prof. CM Wickramatilake,
Dr. Udayanga Galappaththi, Dr. BLS Thilakarathne and Mr. IDKL Fernando in
connection with this volume.

Technical Editing: Mr. N Hettiarachchi

Inquiries: The Librarian
University of Ruhuna
Matara 81000, Sri Lanka
Email: rrj@lib.ruh.ac.lk
URL: http://www.lib.ruh.ac.lk/rohana/

ISSN 1391–0701
All Rights Reserved
© University of Ruhuna
University of Ruhuna
Matara 81000
Sri Lanka.
No part of this material protected by this copyright notice may be reproduced or utilized in any form or by
any means, electronic or mechanical, including recording or by any information storage and retrieval system,
without written permission from the publisher, except as stated below. Single photocopies of single articles
may be made for private study or research. Illustrations and short extracts from the text of individual
contributions may be copied provided that the source is acknowledged, the permission of the authors is
obtained and the Editorial Board of the RŌHANA, Research Journal of the University of Ruhuna is
notified.