Affiliation: | (1) Departamento de Matemáticas Fundamentales, UNED and UPCO, Apartado 19207, 28080 Madrid, Spain;(2) School of Studies in Statistics, Vikram University, Ujjain, 456010, Madhya Pradesh, India;(3) Institute of Management, Nirma University of Science and Technology, Ahmedabad, 382 481, Gujarat, India;(4) Statistical Papers Fakult?t Statistik, Technische Universit?t Dortmund, Vogelpothsweg 87, 44221 Dortmund, Germany |