It's maybe come from Jennifer lab. H3K4me3 is the marker of promoter of lncRNA genes. And H3K36me3 is the markers of gene body of lncRNA genes. My boss wants me to find the first paper that associated with this. However, I don't find this paper until now. Thank you very much! I really appreciate your positive reply! Thank you very much! And good luck！
You can try composing your search as: lncRNA AND H3K4me3 AND H3K36me3, and then sorting results by date in ascending order, e.g.: https://europepmc.org/search?query=lncRNA+AND+H3K4me3+AND+H3K36me3&page=1&sortby=Date%2BASC. The first paper is then from 2010: Long noncoding RNAs in neuronal-glial fate specification and oligodendrocyte lineage maturation (http://europepmc.org/articles/PMC2829031), but you should perhaps check in more details if it is indeed focusing on your topic.