Bhusal, Daya Ram, et al. “Spatial Relation of Bumblebees (Hymenoptera-Apidae) With Host-Plant and Their Conservation Issues: An Outlook from Urban Ecosystem of Kathmandu Valley, Nepal”. European Journal of Ecology, vol. 5, no. 2, Dec. 2019, pp. 1-7, https://doi.org/10.2478/eje-2019-0008.