https://www.sciencedirect.com/science/article/abs/pii/S0378112708005033
(2016) estimating the production and mortality of fine roots using minirizotrons in a pinus densiflora forest in Gwangneung, Korea
https://link.springer.com/article/10.1007/s11676-016-0221-6
(2017) an evaluation of inexpensive methods for root image acquisition when using rhizotrons
https://plantmethods.biomedcentral.com/articles/10.1186/s13007-017-0160-z