Brodlie, K WFisher, D LTolton, G GLambert, T W2014-07-302014-07-3019821467-8659https://doi.org/10.1111/j.1467-8659.1982.tb00037.xThe Development of the NAG Graphical Supplement10.1111/j.1467-8659.1982.tb00037.x133-142