type = "Memo"
}
+@book{ oxley:matroids,
+ title={{Matroid Theory}},
+ author={Oxley, J.G.},
+ year={1992},
+ publisher={Oxford University Press}
+}
+
+@article{ katoh:kmin,
+ author = {N. Katoh and T. Ibaraki and H. Mine},
+ title = {An Algorithm for Finding $K$ Minimum Spanning Trees},
+ publisher = {SIAM},
+ year = {1981},
+ journal = {SIAM Journal on Computing},
+ volume = {10},
+ number = {2},
+ pages = {247--255},
+}