Aisyah, Purnama Dewi (2015) ANALYSING LESSON USING VARIATION THEORY AS AN ANALYTIC FRAMEWORK IN GEOMETRY SUBJECT OF GRADE X. Proceeding of International Conference On Research, Implementation And Education Of Mathematics And Sciences 2015 (ICRIEMS 2015), Yogyakarta State University, 17-19 May 2015. ISSN 978-979-96880-8-8