by 오정학, Oh Jeong-hak
Published in 한국조경학회지 (31.12.2016)

by Kim, Eun-Jeong, Seo, Hae-min, Oh, Jeong-Hak, Park, Chan-Ryul
Published in The Korean Journal of Ornithology (31.12.2020)

by Chung, O.S., Chungnam Development Institute, Gongju, Republic of Korea, Jang, G.S., Yeungnam University, Gyeongsan, Republic of Korea, Oh, J.H., Korea Forest Research Institute, Seoul, Republic of Korea
Published in Animal cells and systems (01.03.2011)

by 정재만, Jae Man Jeong, 오정학, Jeong Hak Oh, 김진선, Jin Seon Kim
Published in 한국조경학회지 (30.12.2013)

by 조세환, Se Hwan Cho, 이명훈, Myeong Hun Lee, 조현길, Hyun Kil Jo, 김인호, In Ho Kim, 안승홍, Seung Hong An, 오정학, Jeong Hak Oh
Published in 한국조경학회지 (31.10.2013)

by 조세환, 이명훈, 조현길, 김인호, 안승홍, 오정학, Cho, Se-Hwan, Lee, Myeong-Hun, Jo, Hyun-Kil, Kim, In-Ho, An, Seung-Hong, Oh, Jeong-Hak
Published in 한국조경학회지 (01.10.2013)

by 오정학, Jeong-hak Oh, 김준수, Jun-soo Kim, 조현제, Hyun-je Cho
Published in 한국산림과학회지 (30.06.2020)

by 오정학, 한상일
Published in 대한경영학회지, 22(5) (01.10.2009)

by 오정학, Jeong Hak Oh, 김준수, Jun-soo Kim, 김학윤, Hak Yun Kim, 조현제, Hyun Je Cho
Published in 한국산림과학회지 (30.06.2019)

by 조재형, 박찬열, 오정학, 김준수, 조현제, Cho, Jae Hyong, Park, Chan Ryul, Oh, Jeong Hak, Kim, Jun Soo, Cho, Hyun Je
Published in 韓國林學會誌 (2016)

by 오정학(Oh, Jeong-Hak), 한상일(Han, Sang-Il)
Published in 대한경영학회지 (2009)

by 김웅환, 오정학
Published in 한국학교수학회논문집 (31.12.2001)

by 김응환, 오정학
Published in 韓國學校數學會論文集 (10.12.2001)