1. Institut Teknologi Sepuluh Nopember,Department of Business Management,Surabaya,Indonesia
2. Institut Teknologi Sepuluh Nopember,Interdiciplinary School of Management Technology,Surabaya,Indonesia
3. Institut Teknologi Sepuluh Nopember,Department of Mathematics,Surabaya,Indonesia
4. University of Szcecin,Doctoral School,Szcecin,Poland