1. National Gallery Technical Bulletin
National Gallery Technical Bulletin / Edited by Lorne Campbell, Susan Foister and Ashok Roy ; Compiled and written by Rachel Billinge, Lorne Campbell, Jill Dunkerton, Susan Foister, Jo Kirby, Jennie Pilc, Ashok Roy, Marika Spring and Raymond White. Vol. 18, [1], 1997. London : National Gallery Publications, 1997. 112 strán. ISBN 1857091787. ISSN 0140-7430.[1, currently available 0, at library only 1]