K. Schonmann, B. Seebacher, K. Andres: A-B ANISOTROPY PROPERTIES OF MILLIMETER-SIZED MONODOMAIN YBA2CU3O7-X SINGLE-CRYSTALS. 1991Physica C: 184. ISBN 0921-4534 http://dx.doi.org/10.1016/0921-4534(91)91499-T