GUMEL AM, GALADİMA H. EFFECT OF GENDER-RELATED DIFFERENCES IN ACADEMIC ACHIEVEMENT AND RETENTION OF SENIOR SECONDARY SCHOOL STUDENTS TAUGHT GEOMETRY USING PROBLEM SOLVING APPROACH. EPESS [Internet]. 2014 Sep. 1 [cited 2024 Dec. 25];1:484-8. Available from: https://epess.net/index.php/epess/article/view/79