Reference:

Katri Huitu, Kai Puolamäki, and Da-Xin Zhang. Critical basis dependence in bounding R-parity breaking couplings from neutral meson mixing. Physics Letters B, 446(3–4):285–289, 1999.

Suggested BibTeX entry:

@article{Huitu99plb2,
    author = {Katri Huitu and Kai Puolam\"aki and Da-Xin Zhang},
    journal = {Physics Letters B},
    number = {3--4},
    pages = {285--289},
    title = {Critical basis dependence in bounding {R}-parity breaking couplings from neutral meson mixing},
    volume = {446},
    year = {1999},
}