共 78 条
[61]
Stier AJ, 2020, Covid-19 attack rate increases with city size, DOI 10.1101/2020.03.22.20041004v2
[62]
Taff B. D., 2017, Recreation, Parks and Tourism in Public Health, V1, P81, DOI 10.2979/rptph.1.1.07
[64]
Tarrant M.A., 1999, Outdoor recreation in American life: a national assessment of demand and supply trends, P403
[65]
Thomsen J.M., 2013, PARK SCI, V30, P30