R. Betteridge Successful experience of using function points to estimate project costs early in the life-cycle. 655-658 1992 34 Inf. Softw. Technol. 10 https://doi.org/10.1016/0950-5849(92)90070-6 https://www.wikidata.org/entity/Q111898120 db/journals/infsof/infsof34.html#Betteridge92