Gao, Y;    Kyle, S;    Lin, J;    Yang, L;    Ren, Y;    Zhu, J;      (2016)    Laser tracker orientation in confined space using on-board targets.                   Measurement Science and Technology , 27  (8)      10.1088/0957-0233/27/8/085010 <https://doi.org/10.1088/0957-0233%2F27%2F8%2F085010>.       Green open access