In case anyone isn't aware of this, google has a search engine called google scholar that is strictly limited to scholarly articles. On a slow day, I decided to look up what scientific articles there might be on Amaryllis. It turns out that there actually is a substantial amount of information out there on how to grow them, mostly pertaining to commercial growers. However, I also believe that this information can be quite helpful to hobbyists so I decided to share my little collection of articles I found potentially useful in helping hobbyists grow amaryllis. Note that usually only the abstract (i.e. summary) is available to non-paying laymen, but that usually includes the majority of information useful to hobbyists anyways.

Best overall growth at 23/18 °C, best bulb growth at 18/13°C and 13/8°C https://www.cabdirect.org/cabdirect/abstract/19729301792

Prepared (mature) bulbs produce the best flowers at 22/18 °C and a light schedule of 3 hrs darkness for every 24 hour cycle

http://www.actahort.org/books/515/515_15.htm

Best growth with 50%-70% of nitrogen fertilizer in nitrate form and the rest as ammonium http://file.scirp.org/pdf/AS_2015123113285920.pdf

Best storage temperature is ~9 °C, re-emergence from dormancy delayed at 21 °C

http://www.actahort.org/books/766/766_21.htm

Some information confirms what we already know widely (on this forum at least):

Twin scales grow best with light exposure

http://www.sciencedirect.com/science/article/pii/0304423894007614

http://www.scielo.br/scielo.php?pid=S0103-90161995000200021&script=sci_arttext

Best growth in porous, well draining media with inorganic components

http://hortsci.ashspublications.org/content/26/9/1168.short

http://www.sungro.com/professional-products?brandID=1&catID=1&productID=79

http://www.sungro.com/professional-products?brandID=2&productID=180

Best growth in 1:1 composted leaves:sand (vs. clay and pure composted leaves) and at highest fertilizing regimen (5g fertilizer/plant) - the main message is that soil aeration (i.e. addition of sand) is important) and that Hippeastrums are heavy feeders.

https://www.cabdirect.org/cabdirect/abstract/20103030137

Some articles contradict common knowledge:

Best field growth at an NPK ratio of 2-4-3.

http://www.banglajol.info/index.php/BJAR/article/view/27675

Usually I'm told that bulbs grow best at a ratio of medium-low-high NPK.

The most interesting article to me is the following one, which claims to have hybridized Hippeastrum with Amaryllis belladonna as well as Brunsvigia orientalis. Conventionally, such crosses are held as impossible due to the genetic distance between the American and African clades of amaryllids. However, this article claims to have overcome these hurdles with a number of advanced techniques. I haven't given the whole article a read because of its length (it's a thesis), but perhaps someone here has some time on their hands. Mostly I'm interested to know whether the crosses succeeded and if yes, why aren't the (presumably spectacular) results thereof in wider circulation?

http://eprints.utas.edu.au/20454/1/whole_JirakiattikulYaowapha1999_thesis.pdf