+ <ul xmlns:ld="http://lambdadelta.info/" id="D2">
+ <li>
+ <span class="emph alpha">∆Λ</span> of
+ N.G. de Bruijn:
+ <span class="emph alpha">Generalizing Automath by means of a lambda-typed lambda calculus</span>
+ (1987).
+ In Lecture Notes in Pure and Applied Mathematics 106, pp. 71-92.
+ Marcel Dekker.
+ </li>
+ </ul>
+ <ul xmlns:ld="http://lambdadelta.info/" id="D3">
+ <li>
+ <span class="emph alpha">λ<sub>∆</sub>
+ </span> of
+ N.J. Rehof, M.H. Sørensen:
+ <span class="emph alpha">The λ<sub>∆</sub>-calculus</span>
+ (1994).
+ In Lecture Notes in Computer Science, 789, pp. 516–542.
+ Springer.
+ </li>
+ </ul>
+ <ul xmlns:ld="http://lambdadelta.info/" id="D4">
+ <li>
+ <span class="emph alpha">λ∆</span> of
+ S. Ronchi Della Rocca, L. Paolini:
+ <span class="emph alpha">The Parametric Lambda Calculus</span>
+ (2004).
+ Texts in Theoretical Computer Science, An EATCS Series.
+ Springer.
+ </li>
+ </ul>
+ <ul xmlns:ld="http://lambdadelta.info/" id="D5">
+ <li>
+ <span class="emph alpha">λD</span> of
+ R. Nederpelt, H. Geuvers:
+ <span class="emph alpha">Type Theory and Formal Proof</span>
+ (2014).
+ Cambridge University Press.
+ </li>
+ </ul>
+ <ul xmlns:ld="http://lambdadelta.info/" id="D6">
+ <li>
+ <span class="emph alpha">Cλξ</span> of
+ N.G. de Bruijn:
+ <span class="emph alpha">A namefree lambda calculus with facilities for internal definition of expressions and segments</span>
+ (1978).
+ TH-report 78-WSK-03.
+ Eindhoven University of Technology, Eindhoven.
+ </li>
+ </ul>
+ <div xmlns:ld="http://lambdadelta.info/" class="text">
+ <img class="icon32" alt="[Smiling face]" title="Smile!" src="http://lambdadelta.info/images/smile.png" />
+ Moreover, the systens of the λδ family <span class="emph alpha">are not</span> related intentionally to
+ <a href="http://umineko.wikia.com/wiki/Lambdadelta">Lady Lambdadelta</a>,
+ the Witch of Certainty of the sound novel
+ <a href="https://it.wikipedia.org/wiki/Umineko_no_naku_koro_ni">Umineko no Naku Koro ni</a>.
+ </div>