The following classic articles on dwarf bearded irises are provided here in pdf format:
Walter Welch, 1967
Bee Warburton, 1957
Ben Hager, 1983
Elsie Zuercher, 1963
Video Presentations on Youtube:
The Smaller Bearded Irises and Their Companion Plants presentation by Kelly Norris to NARGS Piedmont Chapter, 2014
Dwarf Bearded Irises: The Three Types of MDBs narrated powerpoint presentation by Tom Waters, 2020
AIS webinar #19 another presentation of the above (recording of a live presentaiton, with some Q&A)
The AIS blog features the following articles on dwarf bearded irises:
The Earliest Irises: Welcoming Spring
What is a Dwarf Bearded Iris? (...and why are dwarf lovers so persistent?),
Hybridizing with Iris reichenbachii
Ben Hager's Master Plan to Save the MDB ClassTo explore the many MDB cultivars that have been introduced over the years, visit the MDB page at the AIS Iris Encyclopedia.
Photo Credit: El Hutchison, 'Bee Wings' (Brown, 1960)