Crowd translator: on building localized speech recognizers through micropayments. - Jonathan Ledlie; Billy Odero; Einat Minkov; Imre Kiss; Joseph Polifroni (ACM SIGOPS Oper. Syst. Rev., 2009)

Tangaza: frugal group messaging through speech and text. - Billy Odero; Brian Gichana Omwenga; Mokeira Masita-Mwangi; Pauline Githinji; Jonathan Ledlie (ACM DEV, 2010)