Estonian eGovernment services : lesson learnedKalja, Ahto; Põld, Janari; Robal, Tarmo; Vallner, Uuno; Viies, VladimirProceedings of PICMET'13 : Technology Management in the IT-Driven Services : [July 28-August 1, 2013, San Jose, California, USA]2013 / p. 562-568 : ill