HAL (open archive)
3.0 kati ya nyota 5 (kulingana na hakiki 1)
HAL is an open archive where authors can deposit scholarly documents from all academic fields.
Lebo: open archive
Saraka isiyo na Biashara
wale ambao hutoa, hawapaswi kuuliza chochote kwa malipo
wale wanaopokea, hawapaswi kulipa chochote