- He
later licensed his product.
Gallimard Loisirs, ed. (June 28, 2019).
GEOguide Californie (in French). Éditions
Gallimard Loisirs. ISBN 978-2-7424-4235-5...
- Geo-trekking in Ethiopia's
Tropical Mountains. The Dogu'a
Tembien District.
GeoGuide. Switzerland:
Springer International Publishing. pp. 261–277. ISBN 978-3-030-04954-6...
-
Tropical Mountain Climate". Geo-trekking in Ethiopia's
Tropical Mountains.
GeoGuide. SpringerNature. pp. 45–61. doi:10.1007/978-3-030-04955-3_3. ISBN 978-3-030-04954-6...
- Geo-trekking in Ethiopia's
Tropical Mountains – The Dogu'a
Tembien District.
GeoGuide. Cham: SpringerNature. pp. 233–250. doi:10.1007/978-3-030-04955-3_15....
- Troll,
Valentin R. (2018). "The Alnö
Carbonatite Complex,
Central Sweden".
GeoGuide. doi:10.1007/978-3-319-90224-1. ISBN 978-3-319-90223-4. ISSN 2364-6497...
- the
Tembien Tigrayans". Geo-trekking in Ethiopia's
Tropical Mountains.
GeoGuide.
Springer Nature. pp. 63–78. doi:10.1007/978-3-030-04955-3_4. ISBN 978-3-030-04954-6...
-
Sustainable Development". Geo-trekking in Ethiopia's
Tropical Mountains.
GeoGuide. SpringerNature. pp. 361–372. doi:10.1007/978-3-030-04955-3_24. ISBN 978-3-030-04954-6...
-
Reservoir Siltation in Tigray". Geo-trekking in Ethiopia's
Tropical Mountains.
GeoGuide. Cham (CH):
Springer Nature. pp. 345–357. doi:10.1007/978-3-030-04955-3_23...
-
Tropical Mountain Climate". Geo-trekking in Ethiopia's
Tropical Mountains.
GeoGuide. SpringerNature. pp. 45–61. doi:10.1007/978-3-030-04955-3_3. ISBN 978-3-030-04954-6...
- Nyssen, Jan (2019).
Description of
Trekking Routes in Dogu'a Tembien.
GeoGuide. Springer-Nature. pp. 557–675. doi:10.1007/978-3-030-04955-3_38. ISBN 978-3-030-04954-6...
