“…Later, paired Lagrangian calculus introduced by Melrose-Uhlmann [27] and Guillemin-Uhlmann [22], and also studied in Antoniano-Uhlmann [4] was used by Greenleaf-Uhlmann in several of their highly influential works on the study of generalized Radon transforms [17,18]. Microlocal techniques have also been very useful in the context of seismic imaging [5,31,38,29,37,8,12]), in sonar imaging see [11,13,33]), in X-ray Tomography; in addition to works mentioned above also see [32,24,15,14,16]), and in tensor tomography [34,35,39].…”