(Wesolowsky, 1993), (Eiselt et al., 1993), (Bauer et al., 1993), (Bauer et al., 1993), (Schilling et al., 1993), (Plastria, 1993), (Ghosh and Harche, 1993), (Hodgson et al., 1993)

  1993

  (Dunn et al., 1994)

  (Campbell., 1994), (Gao and Robinson, 1994)

  1994

  (Mentzer & Kahn, 1995)

  (Daskin, 1995a), (Mesa & Boffey, 1995), (Plastria, 1995), (Drezner T. , 1995), (Drezner, 1995), (Daskin, 1995b)

  1995

  (Ellram, 1996)

  (ReVelle & Laporte, 1996)

  1996

  (Samuel, 1997), (Kent & Flint, 1997), (Stock, 1997), (Vidal & Goetschalckx, 1997)

  (Shmoys et al., 1997)

  1997

  (Owen & Daskin, 1998)

  (Fleischmann et al., 1998)

  (Avella, et al., 1998), (Hamacher & Nickel, 1998)

  1998

 

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