The following publications are possibly variants of this publication: 
- Kansa-RBF Algorithms for Elliptic Problems in Axisymmetric DomainsAndreas Karageorghis, C. S. Chen, Xiao-Yan Liu. siamsc, 38(1), 2016.  [doi] 
 - Kansa-RBF algorithms for elliptic problems in regular polygonal domainsAndreas Karageorghis, Malgorzata A. Jankowska, C. S. Chen. na, 79(2):399-421, 2018.  [doi] 
 - A Matrix Decomposition MFS Algorithm for Problems in Hollow Axisymmetric DomainsTh. Tsangaris, Yiorgos Sokratis Smyrlis, Andreas Karageorghis. jscic, 28(1):31-50, 2006.  [doi]