Your search returned the following 2 documents:

2. Algorithms for Measuring Perturbability in Matroid Optimization
   Greg N. Frederickson and Roberto Solis-Oba
   Combinatorica 18 (4): 503-518, 1998
   
1. Rooted Spanning Trees with Small Weight and Average Length
   Roberto Solis-Oba and Greg N. Frederickson
   In: Theoretical Computer Science, Prato, Italy, November, 9-11, 1998, 114-125