Natalia Ioustinova Natalia Sidorova A Transformation of SDL Specifications - A Step towards the Verification. 64-78 2001 conf/ershov/2001 Ershov Memorial Conference http://dx.doi.org/10.1007/3-540-45575-2_9 db/conf/ershov/ershov2001.html#IoustinovaS01