Oja، Hannu (2010). Multivariate nonparametric methods with R: An approach based on spatial signs and ranks. Lecture Notes in Statistics. New York, NY: Springer. ج. 199. ص. xiv+232. DOI:10.1007/978-1-4419-0468-3. ISBN:978-1-4419-0467-6. MR:2598854.
Oja، Hannu (2010). Multivariate nonparametric methods with R: An approach based on spatial signs and ranks. Lecture Notes in Statistics. New York, NY: Springer. ج. 199. ص. xiv+232. DOI:10.1007/978-1-4419-0468-3. ISBN:978-1-4419-0467-6. MR:2598854.