Robuta

https://auservicedesenfants.be/ase_math_appl_4e/ ase_math_appl_4e – Au service des enfants math applaseservicedesenfants https://research.ibm.com/publications/on-factoring-positive-operators On factoring positive operators for J. Math. Anal. Appl. - IBM Research On factoring positive operators for J. Math. Anal. Appl. by J Rissanen j mathanal applibm researchfactoringpositive