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] 2 [ PUBLISHED BY THE DEPARTMENT OF INFORMATION SCIENCE Editors : Dov Schwartz, Gila Prebor Editorial Board : Shifra Baruchson - Arbib, Zeev Gries, Colette Sirat, Yaakov Shmuel Spiegel Advisory Board : Malachi Beit - Arié, Moshe Hallamish, Shlomo Zalman Havlin, Y . Tzvi Langermann, Gad Freudenthal, Binyamin Richler, Menahem Schmelzer, Daniel Sperber , Joseph Tabory Address of Editorial Board : Department of Information Science Bar - Ilan University, Ramat Gan, ISRAEL, 5290002 Published with the assistance of The Yehoshua and Bracha Barzilai Foundation, Bar - Ilan University The Faculty of Humanities, Bar - Ilan University ISSN 0334 - 4754 2018 © Copyright Bar - Ilan University, Ramat Gan All rights reserved, including those of translation No part of this journal may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and recording, or by any information storage and retrieval system, without permission in writing from the publisher . ...  אל הספר