共 49 条
[2]
Antic A., 2018, Hotel and Tourism Management, V6, P61, DOI 10.5937/menhottur1802069A
[5]
Bobrowsky P, 2018, SPECIAL PUBLICATIONS, V73
[6]
Bohle M, 2019, EXPLORING GEOETHICS, pXIV
[8]
Cigna A. A, 2016, ACTA CARSOLOGICA, V31
[9]
ENVIRONMENTAL-MANAGEMENT OF TOURIST CAVES - THE EXAMPLES OF GROTTA-DI-CASTELLANA AND GROTTA-GRANDE-DEL-VENTO, ITALY
[J].
ENVIRONMENTAL GEOLOGY,
1993, 21 (03)
:173-180
[10]
Day M., 2016, Acta Carsologica, V31