by Challenge, S., Egeru, A., Nyombi, K.
Published in African crop science journal (25.05.2022)

by Cui, Yi, Yang, Gaojie, Goodwin, Daniel R, O'Flanagan, Ciara H, Sinha, Anubhav, Zhang, Chi, Kitko, Kristina E, Shin, Tay Won, Park, Demian, Aparicio, Samuel, Boyden, Edward S
Published in PloS one (20.09.2023)

by Challenge, S F
Published in Irish independent (20.04.2015)

by Graham Ross, executive officer, Teen Challenge SA
Published in Advertiser (Adelaide, Australia : 1931) (02.12.2006)

by BANK'S CHAIRMAN IS RELISHING LEGAL CHALLENGE, SAYS GARY SILVERMAN
Published in ft.com (24.11.2002)

by KING OF THE HILL, IT'S A SIMPLE GAME WITH , SERIOUS STAKES: THE STEELERS ', CHALLENGE IS TO DETHRONE THE , SUPER BOWL CHAMPIONSBY ED BOUCHETTE, POST-GAZETTE SPORTS WRITER
Published in Pittsburgh post-gazette (Pittsburgh, Pa. 1978) (20.01.2002)